int main()
{
DisplayOpeningScreen("Firstname:Lastname:A00123456:csc34201",
"Submission 05: Building and Displaying Power Sets");
cout << "\nThis program prompts for an integer value n and builds "
"the set\n{1, 2, 3, ..., n}. It then calls a (recursive) function "
"powerSet()\nthat returns the power set of the set. The power set "
"is the set of\nall subsets of the set and has 2^n elements. "
"After displaying the\nsize of the power set, the program calls "
"the function WriteAllSubsets()\nthat outputs each subset using "
"the notation {e_1, e_2, ..., e_m},\nfour sets per line.\n\n";
Pause();
int n;
ReadInt("Enter a non-negative integer "
"(<= 6 if you don't want a lot of output): ", n);
set<int> sInt; //Set of integers whose power set we construct
for (int i=1; i<=n; i++) sInt.insert(i); //Build set {1,2,3, ..., n}
set<set<int>> pSet = powerSet(sInt); //Build the power set
//Output number of subsets, followed by all subsets, four per line
cout << "\nNumber of subsets = " << pSet.size()
<< ", and here they are:\n";
WritePowerSet(pSet);
Pause();
}
//option 6
void AddNewMember
(
fstream& ioFile,
bool& successful
)
{
if(!ioFile.is_open())
{
cout << "\nBinary file not yet open.\nReturning to menu." << endl;
Pause();
successful = false;
}
else
{
ioFile.clear();
string newMemberName;
int newMemberAge;
double newMemberBalance;
//ask for info for the new club member
ReadThisLine("Enter name of new member: ",newMemberName);
ReadInt("Enter age of new member: ", newMemberAge);
ReadDouble("Enter opening balance of new member: ",newMemberBalance);
//clear the array
memset(member.name,'\0',31);
for(unsigned int i = 0 ; i < newMemberName.length(); i++)
member.name[i] = newMemberName[i];
//store the info into the struc
member.age = newMemberAge;
member.balance = newMemberBalance;
ioFile.seekg(0, ios::end);
//write the struc into the binary file
ioFile.write((char *)&member, sizeof(ClubMember));
ioFile.seekg(0);
successful = true;
}
}
//option 7
void UpdateMemberData
(
fstream& ioFile,
bool& successful
)
{
//store the position of the stream(later to be used for seekg/p)
streamoff position;
ioFile.clear();
int count = 0;
if(!ioFile.is_open())
{
cout << "\nBinary file not yet open.\nReturning to menu." << endl;
Pause();
successful = false;
}
else
{
string identity;
ReadThisLine("Enter enough of the member's name to "
"identify him/her: ", identity);
//start at beginning
ioFile.seekg(0);
while(!ioFile.eof())
{
//make a temporary position to hold the beginning of the struc
streamoff tempPos = ioFile.tellg();
//read the binary file
ioFile.read((char *)&member, sizeof(ClubMember));
if(!ioFile.eof())
{
if(((string)member.name).find(identity) != string::npos)
{
//put the beginning of the struc into the position
position = tempPos;
//print club member
cout << "====================\n" << member.name << endl;
cout << "Age: " << member.age << " " << "Balance: $"
<< member.balance << endl;
count++;
}
}
}
if(count != 1)
{
cout << "\n=====>Either more than one member, or no members, "
"matched your input.\n=====>You need to identify a "
"unique club member to update.\n=====>Try again with "
"more specific input.\n" << endl;
Pause();
successful = false;
}
if(count == 1)
{
cout << "\nUpdating data for the above club member." << endl;
string choice;
do
{
cout << "Enter n/a/b to update name/age/balance, or "
"q to quit updating this member: ";
getline(cin,choice);
if(choice == "q")
{
cout << "\nOK, no more updates for this club member "
"at this time." << endl;
Pause();
successful = true;
}
if(choice == "n")
{
string revisedName;
ReadThisLine("Enter revised name: ", revisedName);
//clear the array
memset(member.name,'\0',31);
for(unsigned int i = 0 ; i < revisedName.length(); i++)
//store the new name into the struc
member.name[i] = revisedName[i];
}
if(choice == "a")
{
int newAge;
ReadInt("Enter revised age: ", newAge);
//store new age in struc
member.age = newAge;
}
if(choice == "b")
{
double newBalance;
ReadDouble("Enter revised balance: ", newBalance);
//store new balance in struc
member.balance = newBalance;
}
}
while(choice != "q");
}
ioFile.clear();
//go to the position
ioFile.seekg(position);
ioFile.seekp(position);
//finally write the info back into the binary file
ioFile.write((char *)&member, sizeof(ClubMember));
successful = true;
}
}
