ActionBase::ResultE Switch::render(Action *action)
{
ActionBase::ResultE returnValue = ActionBase::Continue;
DrawActionBase *da = dynamic_cast<DrawActionBase *>(action);
if((getChoice() >= 0 ) &&
(UInt32(getChoice()) < action->getNNodes()))
{
da->useNodeList();
if(da->isVisible(action->getNode(getChoice())))
{
da->addNode(action->getNode(getChoice()));
}
}
else if(getChoice() == ALL)
{
if(da->selectVisibles() == 0)
{
returnValue = ActionBase::Skip;
}
}
else
{
returnValue = ActionBase::Skip;
}
return returnValue;
}
void ramPresetTab::guiEvent(ofxUIEventArgs &e) {
int choice = getChoice(e, cameraPresetRadio);
if(choice != -1) {
int indices[] = {0, 1, 5};
int choice = getChoice(cameraPresetRadio);
ramCameraManager::instance().rollbackDefaultCameraSetting(indices[choice]);
}
}
int main(void){
double balance = 0, wager = 0;
int choice = 0;
printGameRules();
balance = getBankBalance();
//Display game menu and allow user to continually choose options until they quit
while(choice != 4){
displayGameMenu();
choice = getChoice();
switch (choice){
case 1:
printf("Current bank balance: $%.2lf\n", balance);
break;
case 2:
balance = addMoney(balance);
printf("You now have $%.2lf in the bank\n", balance);
break;
case 3:
balance = playRound(balance);
break;
case 4:
break;
default:
printf("\nMenu choice is invalid, Please choose a number between 1 and 4\n"); //Validates menu choice
break;
}
}
return 0;
}
//
// sets
//
void Choice::setChoice(int choice)
{
m_choice = choice;
if (m_choice < 0) m_choice = 0;
if (m_choice >= (int)m_choices.size()) m_choice = 0;
changeCaption(getChoice());
}
int main(){
// create queue
int queue[QUEUE_SIZE]={0};
int rear = 0;
int front = 0;
int choice;
while(1){
showInitile();
choice = getChoice();
switch(choice){
case 1:
displayQueue(queue);
break;
case 2:
Enqueue(queue, &rear, &front);
break;
case 3:
delqueue(queue, &rear, &front);
break;
case 4:
system("CLS");
break;
default:
printf("你壞壞\n");
break;
}
}
system("pause");
return 0;
}
void deleteAllContacts (int *iLen, int *iCap) {
// If no entries are stored, the request is declined and the user is informed.
if (*iLen > 0) {
// The user chooses whether to confirm the decision to delete all contacts.
char cConfirmChoice = '\0';
printf ("\nDo you wish to delete all contacts?");
printf ("\n\t(1) Yes");
printf ("\n\t(2) No\n");
getChoice (&cConfirmChoice, '2');
/* If the user chooses to continue deleting all contacts, the following
* procedure is executed: the length and capacity counters of the PhoneBook
* are both set to zero.
*/
if (cConfirmChoice == '1') {
*iLen = 0;
*iCap = 0;
printf ("All contacts have been deleted.\n");
}
else
printf ("All contacts have been retained.\n");
}
else
printf ("There are no contacts to delete.\n");
}
/* ---------------------- MAZE MAIN PROGRAM --------------------------------*/
void main() {
int x1;
int y1;
int r,cl;
int isX;
int choice;
progname();
_setcursortype(_NOCURSOR);
textmode(64);
textbackground(BLUE);
for(;;){
choiceID = 1;
display_atik_atik_Menu();
choice = getChoice();
switch(choice){
case 1:
playMaze();
break;
case 2:
viewGameDevelopers();
break;
case 3:
exit(0);
break;
}
}
}
int profileManager(int choice){
int fileFlag,option;
FILE *pProfiles;
fileFlag=checkFileExists("profiles.txt");
switch(choice){
case 1:
if(fileFlag){
pProfiles=fopen("profiles.txt","r");
printProfiles(pProfiles);
option = getChoice();
if(tolower(option) == 'n'){
addProfile();
}else if(tolower(option) == 'q'){
fclose(pProfiles);
return 0;
}else if(tolower(option) == 'd'){
}else{
}
fclose(pProfiles);
return option-'0';
}else{
return makeProfileFile();
}
case 2:
if(fileFlag){
}else{
}
}
}
void luProjPanel::OnObjTypeChanged(wxCommandEvent& event)
{
wxChoice* choice = getChoice();
int sel = choice->GetCurrentSelection();
int type = (int)choice->GetClientData(sel);
//gkPrintf("%d %d", sel, type);
}
int DIALOG_LAYERS_SETUP::getLayerTypeIndex( LAYER_NUM aLayer )
{
wxChoice* ctl = getChoice( aLayer );
int ret = ctl->GetCurrentSelection(); // indices must have same sequence as LAYER_T
return ret;
}
//
// Pour quand on clic dessus, le child saura quoi faire
//
void Choice::onRightClic()
{
dksPlaySound(m_sfxClic, -1, 200);
// On loop les choix
m_choice--;
if (m_choice < 0) m_choice = (int)m_choices.size() - 1;
changeCaption(getChoice());
}
//
// Pour quand on clic dessus, le child saura quoi faire
//
void Choice::onClic()
{
dksPlaySound(m_sfxClic, -1, 200);
// On loop les choix
m_choice++;
if (m_choice >= (int)m_choices.size()) m_choice = 0;
changeCaption(getChoice());
}
void DIALOG_LAYERS_SETUP::showLayerTypes()
{
for( LAYER_NUM copperLayer = FIRST_COPPER_LAYER;
copperLayer <= LAST_COPPER_LAYER; ++copperLayer )
{
wxChoice* ctl = getChoice( copperLayer );
ctl->SetSelection( m_Pcb->GetLayerType( copperLayer ) );
}
}
task main()
{
if(getChoice("What pitch?", "Low", "High") == 0)
{
PlayImmediateTone(440, 100);
}else{
PlayTone(880, 100);
}
wait1Msec(1000);
}
void DIALOG_LAYERS_SETUP::showLayerTypes()
{
for( LSEQ seq = LSET::AllCuMask().Seq(); seq; ++seq )
{
LAYER_ID cu_layer = *seq;
wxChoice* ctl = getChoice( cu_layer );
ctl->SetSelection( m_Pcb->GetLayerType( cu_layer ) );
}
}
int main(){
int choice = 0;
do{
choice = getChoice("Please select an action", menu);
printf("You have chose: %c\n", choice);
}while(choice != 'q');
exit(0);
}
ActionBase::ResultE Switch::intersect(Action *action)
{
ActionBase::ResultE returnValue = ActionBase::Continue;
IntersectAction *ia = dynamic_cast<IntersectAction *>(action);
if((getChoice() >= 0 ) &&
(UInt32(getChoice()) < ia->getNNodes()) )
{
ia->useNodeList( );
ia->addNode (ia->getNode(getChoice()));
}
else if(getChoice() == ALL)
{
returnValue = ActionBase::Continue;
}
else
{
returnValue = ActionBase::Skip;
}
return returnValue;
}
void ramPresetTab::guiEvent(ofxUIEventArgs &e)
{
// camera
int choice = getChoice(e, preset_cam_radio);
if(choice != -1)
{
int indices[] = {0, 1, 5};
int choice = getChoice(preset_cam_radio);
ramCameraManager::instance().rollbackDefaultCameraSetting(indices[choice]);
}
// preset scenes
const string name = e.widget->getName();
if (name == "Line") callPreset(0);
else if (name == "Hasty Chase") callPreset(1);
else if (name == "HC + Stamp") callPreset(2);
else if (name == "HC + Stamp + Natto") callPreset(3);
else if (name == "HC + Future") callPreset(4);
else if (name == "Line + Future") callPreset(5);
else if (name == "Particles + Future") callPreset(6);
else if (name == "Particles") callPreset(7);}
int main()
{
try
{
const string stageFilename = getFilename( stage_ );
const string riderFilename = getFilename( rider_ );
//
// Setup the race data analyzer
//
RaceAnalyzer raceData( stageFilename, riderFilename );
bool done = false;
//
// Loop until the userwants to quite
//
while( ! done )
{
//
// Get a process the user's menu choice
//
switch( getChoice() )
{
case menuDisplaySummary_ : displaySummary( raceData );
break;
case menuDisplayRiders_ : displayRiderData( raceData );
break;
case menuDisplayTeams_ : displayTeamData( raceData );
break;
case menuQuit_ : done = true;
break;
default : assert(true);
}
}
}
catch(...)
{
system("pause");
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
/*
Main menu interface
*/
void run(FILE *file) {
int choice = 0;
while (1) {
displayMenu();
choice = getChoice();
if (choice == -2) {
exit(0);
} else if (choice == -1) {
append(file);
} else if (choice == 0) {
displayAll(file);
} else if (choice > 0) {
modifyRecord(choice, file);
} else {
printf("\n%s\n", "Invalid choice, try again!");
}
}
}
/* ===== process =====
This function presents the user with the menu.
Pre hash, list, tree
Post nothing
*/
void process (HASH *hash, D_LIST *list, BST_TREE *tree)
{
// Local Definitions
char choice;
CAR car;
// Statements
do
{
choice = getChoice ();
switch (choice)
{
case 'P': printHash(hash);
printLinkedList(list);
printManager(tree);
break;
case 'R': printIndentedBST(tree);
break;
case 'E': printData(hash);
break;
case 'S': searchByHash(hash, list);
break;
case 'T': searchByDList(list);
break;
case 'I': car = addNewNode();
insert(hash,car);
insertDNode(list, car);
insertTree(tree,car);
break;
case 'D': deleteCar(list, hash, tree);
break;
case 'W': writeToFile(list);
break;
case 'Q': break;
} // switch
} while (choice != 'Q');
return;
} // process
main()
{
Student students[10],s;
char sname[10];
int n,i,choice;
do
{
choice = getChoice();
switch(choice)
{
case 1:
cout<<"\n Enter how many students records:";
cin>>n;
for(i = 0;i < n;i ++)
{
cout<<"\n Enter details of student "<<i+1;
students[i].getData();
}
break;
case 2:
cout<<"\n Enter which student ditails want to display:";
cin>>sname;
cout<<"\n Roll No \tName\tMarks1\tMarks2\tMarks3\n";
s.displayDetails(students,sname,n);
break;
case 3:
cout<<"\n Student information. ";
cout<<"\n Roll No \tName\tMarks1\tMarks2\tMarks3\n";
s.displayDetails(students,n);
break;
}
}while(choice != 4);
getch();
return 0;
}
void loadContactsFromFile (ContactType **pList, int *iLen, int *iCap)
{
char cConfirmChoice = '1';
/* If there are contacts in memory, the user is asked whether to proceed
* with loading from the file, which will overwrite the stored contacts.
*/
if (*iLen > 0) {
printf ("\nCurrently stored contacts will be lost. Continue?");
printf ("\n\t(1) Yes");
printf ("\n\t(2) No\n");
getChoice (&cConfirmChoice, '2');
}
/* If there were no contacts stored in memory, or if the user decided
* to overwrite them, then the procedure continues. Otherwise, loading
* the contacts is aborted and the contacts stored in memory are retained.
*/
if (cConfirmChoice == '1') {
const char *cDefaultFileName = "contacts.dat";
char cFileChoice = '\0';
char cFileName[51] = "";
FILE *pRead = NULL;
// The user chooses whether to specify a path or accept the default.
printf ("\nWhere are the contacts saved?");
printf ("\n\t(1) Specify file-name path.");
printf ("\n\t(2) Use default file-name path.\n");
getChoice (&cFileChoice, '2');
// If the user chose to specify a path:
if (cFileChoice == '1') {
char *cInputString = NULL;
int iMaxLength = 1000;
while (cInputString == NULL && iMaxLength > 0) {
cInputString = (char *) calloc(iMaxLength + 1, sizeof(char));
iMaxLength -= 10;
}
if (cInputString != NULL) {
// Get the user's path choice and copy it to cFileName.
printf ("File-name (and location): ");
scanf ("%s", cInputString);
strncpy (cFileName, cInputString, 50);
}
else {
// If cInputString was not allocated memory, terminate the program.
perror("Out of memory");
exit(EXIT_FAILURE);
}
// Allocated memory is freed from cInputString.
free(cInputString);
}
else
// If the user chose to accept the default path:
strncpy (cFileName, cDefaultFileName, 50);
// Open the file for reading.
pRead = fopen(cFileName, "r");
/* If the file was opened successfully, begin loading data. Otherwise
* issue an error.
*/
if (pRead != NULL) {
/* Read the first field in the data file as an integer. This will be
* the number of records which will be stored. Since struct array
* may not hold enough space for this many records, this value must
* be used to allocate space.
*/
int iNewCap = 0;
fscanf (pRead, "%d", &iNewCap);
ContactType *pNewList = NULL;
pNewList = (ContactType *) realloc(*pList, iNewCap * sizeof(ContactType));
/* If the allocation was successful, then the struct array is moved to the
* the new pointer, and the new capacity is recorded.
*/
if (pNewList != NULL) {
*pList = pNewList;
*iCap = iNewCap;
}
else {
// If the allocation was unsuccesful, the program ends.
perror ("Out of memory");
exit(EXIT_FAILURE);
}
/* Now, the data can be read into the array of ContactType. The integer
* value at the beginning of the file determined how many entries will be
* read.
*/
int i;
for (i = 0; i < *iCap; i++)
fscanf (pRead, "%s%s%s", (*pList + i)->cFirstName, (*pList + i)->cLastName, (*pList + i)->cPhoneNumber);
/* The length of the list of entries is recorded as *iCap, the number of
* entries saved.
*/
*iLen = *iCap;
// Close the file and notify the user that the contacts have been loaded.
fclose (pRead);
printf ("Contacts loaded from %s.\n", cFileName);
}
else {
// If the file could not be opened, notify the user.
printf ("Invalid file-name or location.\n");
printf ("Currently stored contacts are retained.\n");
}
}
else
// If the user chose not to overwrite stored contacts, notify her and continue execution.
printf ("Currently stored contacts are retained.\n");
}
User *chooseUser(){
int unumber;
showUsers();
unumber = getChoice();
return &users[(unumber - 1)];
}
int main(){
FILE *fp, *ft;
char another, choice;
/** structure to employee */
struct emp{
char name[50];
int age;
float salary;
} e;
char empname[50];
long int recsize;
/**
* Opening file if exits or creating new file
*/
fp = fopen(FILE_NAME,"rb+");
if(fp == NULL)
{
fp = fopen(FILE_NAME,"wb+");
if(fp == NULL)
{
printf("Cannot open the file");
exit(1);
}
}
recsize = sizeof(e);
while(1)
{
choice = getChoice();
switch(choice)
{
case '1': // Add Record
system("cls");
fseek(fp,0,SEEK_END);
another = 'y';
while(another == 'y')
{
printf("\nEnter name: ");
scanf("%s",e.name);
printf("\nEnter age: ");
scanf("%d", &e.age);
printf("\nEnter basic salary: ");
scanf("%f", &e.salary);
fwrite(&e,recsize,1,fp);
printf("\nAdd another record(y/n) ");
fflush(stdin);
another = getche();
}
break;
case '2': // List Record
system("cls");
rewind(fp);
while(fread(&e,recsize,1,fp)==1)
{
printf("\n%s %d %.2f",e.name,e.age,e.salary);
}
getch();
break;
case '3': // Modify Record
system("cls");
another = 'y';
while(another == 'y')
{
printf("Enter the employee name to modify: ");
scanf("%s", empname);
rewind(fp);
while(fread(&e,recsize,1,fp)==1)
{
if(strcmp(e.name,empname) == 0)
{
printf("\nEnter new name,age and basic salary: ");
scanf("%s%d%f",e.name,&e.age,&e.salary);
fseek(fp,-recsize,SEEK_CUR);
fwrite(&e,recsize,1,fp);
break;
}
}
printf("\nModify another record(y/n)");
fflush(stdin);
another = getche();
}
break;
case '4': // Delete Record
system("cls");
another = 'y';
while(another == 'y')
{
printf("\nEnter name of employee to delete: ");
scanf("%s",empname);
ft = fopen(TEMP_FILE_NAME,"wb");
rewind(fp);
while(fread(&e,recsize,1,fp) == 1)
{
if(strcmp(e.name,empname) != 0)
{
fwrite(&e,recsize,1,ft);
}
}
fclose(fp);
fclose(ft);
remove(FILE_NAME);
rename(TEMP_FILE_NAME,FILE_NAME);
fp = fopen(FILE_NAME, "rb+");
printf("Delete another record(y/n)");
fflush(stdin);
another = getche();
}
break;
case '5': // Exit Program
system("cls");
moveLocation(0,5);
fclose(fp);
printf("Bye././. Have a nice day");
moveLocation(0,7);
exit(0);
}
}
return 0;
}
int main(int argc, char **argv){
List list = LLCreate();
Stack stack = SCreate();
Queue queue = QCreate();
User *usr;
setupUsers();
MENU_CHOICE m_choice = MAIN_MENU;
int choice, count;
menu();
choice = getChoice();
while(choice){
switch(m_choice){
case MAIN_MENU:
switch(choice){
case 1:
m_choice = LL_MENU;
llmenu();
break;
case 2:
m_choice = QUEUE_MENU;
qmenu();
break;
case 3:
m_choice = STACK_MENU;
smenu();
break;
case 4:
showUsers();
menu();
break;
case 0:
exit(0);
break;
default:
m_choice = MAIN_MENU;
menu();
}
break;
case LL_MENU:
switch(choice){
case 1:
printf("\n%s\n", "adding head, choose a user");
usr = chooseUser();
printf("%s %s\n", "You chose ", usr -> name);
LLAddHead(usr, list);
llmenu();
break;
case 2:
printf("\n%s\n", "adding tail, choose a user");
usr = chooseUser();
printf("%s %s\n", "You chose", usr -> name);
LLAddTail(usr, list);
llmenu();
break;
case 3:
printf("\n%s\n", "removing head");
LLRemoveHead(list);
llmenu();
break;
case 4:
printf("\n%s\n", "removing tail");
LLRemoveTail(list);
llmenu();
break;
case 5:
print(list);
llmenu();
break;
case 6:
m_choice = MAIN_MENU;
menu();
break;
case 0:
exit(0);
break;
default:
m_choice = LL_MENU;
}
break;
case QUEUE_MENU:
switch(choice){
case 1:
printf("\n%s\n", "enqueueing, choose a user");
usr = chooseUser();
printf("%s %s\n", "You chose ", usr -> name);
Qenqueue(usr, queue);
qmenu();
break;
case 2:
printf("\n%s\n", "dequeueing");
Qdequeue(queue);
qmenu();
break;
case 3:
print(queue);
qmenu();
break;
case 4:
m_choice = MAIN_MENU;
menu();
break;
case 0:
exit(0);
break;
default:
m_choice = QUEUE_MENU;
}
break;
case STACK_MENU:
switch(choice){
case 1:
printf("%s\n", "push");
smenu();
break;
case 2:
printf("%s\n", "pop");
smenu();
break;
case 3:
printf("%s\n", "top");
smenu();
break;
case 4:
printf("%s\n", "print");
smenu();
break;
case 5:
m_choice = MAIN_MENU;
menu();
break;
case 0:
exit(0);
break;
default:
m_choice = STACK_MENU;
}
break;
}
choice = getChoice();
}
return 0;
}
/* showAllContacts allows the user to sort the contacts by first or last name
* (or choose not to sort the contacts) and then displays them all in a list.
*/
void showAllContacts (ContactType *pList, int *iLen) {
int i;
/* If the contact list has fewer than two entries, then sorting is trivial.
* Therefore the sorting menu is presented only if the length of the list
* is larger than 1.
*/
if (*iLen > 1) {
// cSortChoice will store the user's choice from the sorting menu.
char cSortChoice = '\0';
/* lContactsSwapped and TempHolder are needed for the sorting algorithm
* (bubble-sort). lContactsSwapped is a logical variable that indicates
* whether two entries in the list have been exchanged in the previous
* pass through the list. TempHolder holds an entry temporarily so that
* it does not get unintendedly overwritten while it is being swapped.
*/
int lContactsSwapped;
ContactType TempHolder = {""};
// The sorting menu is displayed and the user's choice obtained.
printf ("\nWould you like to sort the entries?");
printf ("\n\t(1) by Last Name");
printf ("\n\t(2) by First Name");
printf ("\n\t(3) Do Not Sort\n");
getChoice (&cSortChoice, '3');
/* The bubble-sort algorithm. On each pass through the array of ContactType
* adjacent entries are compared, and swapped if they are out of order.
* The process repeats if any two entries had to be swapped in the previous
* iteration. Once the array has been passed through without a swap, the
* list is known to be sorted.
*/
do {
lContactsSwapped = 0;
i = 0;
while (i < *iLen - 1) {
/* lSwapNeeded indicates whether the entry indexed by i should be
* exchanged with the entry in the following position. lSwapNeeded
* is a logical integer variable determined according to the user's
* choice of sorting criteria. If the user chose not to sort the
* list, lSwapNeeded retains its initialized value, 0/false.
*/
int lSwapNeeded = 0;
switch (cSortChoice) {
case '1':
lSwapNeeded = strcmp((pList + i)->cLastName, (pList + i + 1)->cLastName) > 0;
break;
case '2':
lSwapNeeded = strcmp((pList + i)->cFirstName, (pList + i + 1)->cFirstName) > 0;
break;
}
// If an exchange is necessary, this simple procedure accomplishes it.
if (lSwapNeeded) {
TempHolder = *(pList + i);
*(pList + i) = *(pList + i + 1);
*(pList + i + 1) = TempHolder;
lContactsSwapped = 1;
}
i++;
}
} while (lContactsSwapped);
}
// Once sorting is complete, or if sorting was not necessary, the list is printed.
printf ("\nPhone Book Contacts (%d):", *iLen);
for (i = 0; i < *iLen; i++)
printf ("\n%s\t%s\t%s", (pList + i)->cFirstName, (pList + i)->cLastName, (pList + i)->cPhoneNumber);
printf ("\n");
}
void findContact (ContactType *pList, int *iLen) {
/* The user is allowed to search for a contact only if there is at least
* one contact stored.
*/
if (*iLen > 0) {
// cInputString is prepared just as above in function getChoice.
char *cInputString = NULL;
int iMaxLength = 1000;
while (cInputString == NULL && iMaxLength > 0) {
cInputString = (char *) calloc(iMaxLength + 1, sizeof(char));
iMaxLength -= 10;
}
/* If cInputString was allocated memory, then the user can proceed
* to input field data into cInputString.
*/
if (cInputString != NULL) {
char cSearchChoice = '\0';
int i = 0;
int lMatchFound = 0;
// The user can choose which field to use as a basis for the search.
printf ("\nHow would you like to search?");
printf ("\n\t(1) by Last Name");
printf ("\n\t(2) by First Name");
printf ("\n\t(3) by Phone Number\n");
getChoice (&cSearchChoice, '3');
/* The user enters a field value to search for. If the value
* is the same as the corresponding field in a list entry, the
* whole entry is printed. Because this procedure uses strcmp()
* to compare, the user's search value must match exactly,
* including case.
*
* Depending on the user's choice, she may search for a particular
* last name, first name, or phone number. All entries with the
* same value for the target field will be displayed.
*/
switch (cSearchChoice) {
case '1':
printf ("\nLast Name: ");
scanf ("%s", cInputString);
while (i < *iLen) {
if (!strcmp((pList + i)->cLastName, cInputString)) {
printf ("%s\t%s\t%s\n", (pList + i)->cFirstName, (pList + i)->cLastName, (pList + i)->cPhoneNumber);
lMatchFound = 1;
}
i++;
}
break;
case '2':
printf ("\nFirst Name: ");
scanf ("%s", cInputString);
while (i < *iLen) {
if (!strcmp((pList + i)->cFirstName, cInputString)) {
printf ("%s\t%s\t%s\n", (pList + i)->cFirstName, (pList + i)->cLastName, (pList + i)->cPhoneNumber);
lMatchFound = 1;
}
i++;
}
break;
case '3':
printf ("\nPhone Number: ");
scanf ("%s", cInputString);
while (i < *iLen) {
if (!strcmp((pList + i)->cPhoneNumber, cInputString)) {
printf ("%s\t%s\t%s\n", (pList + i)->cFirstName, (pList + i)->cLastName, (pList + i)->cPhoneNumber);
lMatchFound = 1;
}
i++;
}
break;
}
/* If the logical variable lMatchFound was never set to 1, then no
* match was found, and the user is notified.
*/
if (!lMatchFound)
printf ("No matches were found.\n");
}
else {
// If cInputString was not allocated memory, terminate the program.
perror("Out of memory");
exit(EXIT_FAILURE);
}
// Free allocated memory.
free(cInputString);
}
else
// If (*iLen == 0),
printf ("There are no contacts to choose from.\n");
}
// Main function: Program execution begins.
main()
{
/* Phonebook points to (the first element) of an array of structures
* of ContactType. Each element of the array contains all the
* information for one record: first name, last name, and phone
* number. Integer variables iLength and iCapacity each contain
* information about the array. iCapacity indicates the number of
* entries which can be stored according to current memory allocation;
* when iCapacity = 5, then no more than 5 records can be stored.
* iLength indicates the number of records that are currently stored.
* (Therefore, the last element in the array is indexed by iLength - 1.)
*/
ContactType *PhoneBook;
int iLength = 0;
int iCapacity = 0;
/* PhoneBook is allocated enough memory to match its current listed
* capacity. Of course, here, the listed capacity is 0, so PhoneBook
* is not assigned any memory according to the calloc function. This
* assignment is included for form's sake, to match the free(PhoneBook)
* statement at the end of the main() function. Adhering to the form
* of matching memory allocation and memory freeing will ensure careful
* programming.
*/
PhoneBook = (ContactType *) calloc(iCapacity, sizeof(ContactType));
/* cUserChoice will take on the value of the user's main menu choice.
* The following loop will continue to execute until the user chooses
* to exit. The constant identifier cLastChoice contains the character
* representing the last available choice ('Exit'). If the program
* is modified to accommodate a larger or smaller menu, this constant
* can be changed conveniently.
*/
char cUserChoice = '\0';
const char cLastChoice = '9';
do {
// The menu is displayed and the user enters her choice.
printMainMenu ();
getChoice (&cUserChoice, cLastChoice);
// The appropriate function is called.
switch (cUserChoice) {
case '1':
showAllContacts (PhoneBook, &iLength);
break;
case '2':
addContact (&PhoneBook, &iLength, &iCapacity);
break;
case '3':
findContact (PhoneBook, &iLength);
break;
case '4':
getRandomContact (PhoneBook, &iLength);
break;
case '5':
deleteContact (PhoneBook, &iLength);
break;
case '6':
deleteAllContacts (&iLength, &iCapacity);
break;
case '7':
saveContactsToFile (PhoneBook, &iLength);
break;
case '8':
loadContactsFromFile (&PhoneBook, &iLength, &iCapacity);
break;
}
// The application continues until the user chooses to exit.
} while (cUserChoice != cLastChoice);
// Freeing allocated memory.
free (PhoneBook);
printf ("\nGoodbye!\n\n");
}
void saveContactsToFile (ContactType *pList, int *iLen)
{
// The function will not attempt to save contacts if none are in memory.
if (*iLen > 0) {
/* The constant string pointer cDefaultName stores the default file location.
* cFileChoice stores the user's choice: whether 1) to enter a file location
* or 2) accept the default file location. The FILE pointer pWrite will hold
* the address of the filestream where the data will be saved.
*/
const char *cDefaultFileName = "contacts.dat";
char cFileChoice = '\0';
char cFileName[51] = "";
FILE *pWrite = NULL;
// The user chooses whether to specify a path or accept the default.
printf ("\nWhere do you want to save the contacts?");
printf ("\n\t(1) Specify file-name path.");
printf ("\n\t(2) Use default file-name path.\n");
getChoice (&cFileChoice, '2');
/* If the user chose to enter a file location, then she is prompted
* for one and the input is saved as cInputString and copied to
* cFileName. If she chose to accept the default, then cDefaultFileName
* is copied to cFileName.
*/
if (cFileChoice == '1') {
char *cInputString = NULL;
int iMaxLength = 1000;
while (cInputString == NULL && iMaxLength > 0) {
cInputString = (char *) calloc(iMaxLength + 1, sizeof(char));
iMaxLength -= 10;
}
if (cInputString != NULL) {
printf ("File-name (and location): ");
scanf ("%s", cInputString);
strncpy (cFileName, cInputString, 50);
}
else {
// If cInputString was not allocated memory, terminate the program.
perror("Out of memory");
exit(EXIT_FAILURE);
}
// Allocated memory is freed from cInputString.
free(cInputString);
}
else
strncpy (cFileName, cDefaultFileName, 50);
// The file is opened for writing, and the filestream is saved as pWrite.
pWrite = fopen(cFileName, "w");
// If the file was opened successfully, we continue. Otherwise, an error is printed.
if (pWrite != NULL) {
// The first field of data written to the file is the number of entries.
fprintf (pWrite, "%d\n", *iLen);
// Now, the entries are written to the file using a for-loop.
int i;
for (i = 0; i < *iLen; i++)
fprintf (pWrite, "%s\t%s\t%s\n", (pList + i)->cFirstName, (pList + i)->cLastName, (pList + i)->cPhoneNumber);
// Finally, the file is closed, and a message is printed to the user.
fclose (pWrite);
printf ("Contacts saved to %s.\n", cFileName);
}
else
printf ("Invalid file-name or location.\n");
}
// If no contacts are in memory, then an error is printed to the user and the program continues.
else
printf ("There are no contacts to save.\n");
}