int main()
{
Stack S = CreateStack(2*numberOfOperator);
char string[1000];
fgets(string,1000,stdin);
char* str =NULL;
str = strtok(string, " \n");
while(str != NULL) {
if(notOp(str[0]))
{
Token t= malloc(sizeof(struct token));
t->str=str;
t->Type = Term;
Push(t,S);
}
else {
Operator Op = str[0];
Token token2 = TopAndPop(S);
Token token1 = TopAndPop(S);
Token token3 = concatenate(token1,token2,Op);
Push(token3,S);
}
str = strtok(NULL, " \n");
}
printf("%s\n",TopAndPop(S)->str);
return 0;
}
double midfixCal(void)
{
int flag;
unsigned char ope[5];
unsigned char pre_ope;
double term;
double op1,op2;
int priv,pre_priv;//优先级
Stack M = CreateStack( StackLen );//这个栈用来将中缀表达式转换成后缀
Stack S = CreateStack( StackLen );//这个栈用来计算后缀表达式的值
printf("Enter the midfix expression only + * - / () allowed.\n");
while(1){
flag = scanf("%[+*-/()=]",ope);
if(flag == 0){
if(scanf("%lf",&term) == 1){
getchar();
Push( term ,S);
}
}
else if( ope[0] == '+' || ope[0] == '*' || ope[0] == '-' || ope[0] == '/' || ope[0] == '(' ){
getchar();
priv = AssignPriv( ope[0] );
while(!IsEmpty(M)){
pre_ope = (unsigned char)Top(M);
pre_priv = AssignPriv(pre_ope);
if(pre_priv >= priv && pre_ope != '(' ){
Pop(M);
CalPostFix(pre_ope,S);//计算后缀表达式的值
}
else
break;
}
Push( (double)ope[0],M);
}
else if( ope[0] == ')'){
getchar();
//将栈中的元素直到 '('弹出
while( ( (unsigned char)Top(M) ) != '('){
pre_ope = TopAndPop(M);
CalPostFix(pre_ope, S);
}
Pop(M);//弹出'('
}
else if( ope[0] == '=' ){
while(!IsEmpty(M)){
pre_ope = TopAndPop(M);
CalPostFix(pre_ope,S);
}
return TopAndPop(S);//返回S栈顶的元素，即是最终结果
}
}//while结束
}
//3.18a
void languageExamine(char *s)
{
Stack S = CreateStack(100);
while (*s != '\0') {
switch (*s) {
case 'b':
if (*(s + 1) == 'e' || *(s + 2) == 'g' || *(s + 3) == 'i' || *(s + 4) == 'n')
Push('b', S);
break;
case '(':
Push('(', S);
break;
case '[':
Push('[', S);
break;
case '{':
Push('{', S);
break;
case 'e':
if (*(s + 1) == 'n' || *(s + 2) == 'd')
if (TopAndPop(S) != 'b') {
printf("warning: losing \"begin\" before \"end\"\n");
return;
}
break;
case ')':
if (TopAndPop(S) != '(') {
printf("warning: losing \"(\" before\")\"\n");
return;
}
break;
case ']':
if (TopAndPop(S) != '[') {
printf("warning: losing \"[\" before\"]\"\n");
return;
}
break;
case '}':
if (TopAndPop(S) != '{') {
printf("warning: losing \"{\" before\"}\"\n");
return;
}
break;
default:
break;
}
s++;
}
if (!IsEmpty(S))
printf("Wrong Syntax! Something missing but tired to check:)\n");
else
printf("Correct Sytax\n");
DisposeStack(S);
}
int main(){
Stack stack;
stack = CreateStack(1000);
int temp;
for(temp=0;temp<100;temp++){
Push(temp, stack);
}
while(!IsEmpty(stack)){
printf("%d\n", TopAndPop(stack));
}
return 0;
}
int main()
{
char c;
Stack S = Create(SIZE);
while (scanf("%c", &c) != EOF)
{
int a, b;
switch (c)
{
case '+':
b = TopAndPop(S);
a = TopAndPop(S);
Push(a+b, S);
break;
case '-':
b = TopAndPop(S);
a = TopAndPop(S);
Push(a-b, S);
break;
case '*':
b = TopAndPop(S);
a = TopAndPop(S);
Push(a*b, S);
break;
case '/':
b = TopAndPop(S);
a = TopAndPop(S);
Push(a/b, S);
break;
default:
Push(ToInt(c), S);
break;
}
getchar();
}
int ans = TopAndPop(S);
printf("%d\n", ans);
Dispose(S);
return 0;
}
//3.19 postfixCalculator()
ElementType postfixCalculator(char *s[])
{
Stack S = CreateStack(100);
while (*s != NULL) {
if (!strcmp(*s, "+"))
Push(TopAndPop(S) + TopAndPop(S), S);
else if (**s == '*')
Push(TopAndPop(S) * TopAndPop(S), S);
else if (**s == '-')
Push(-TopAndPop(S) + TopAndPop(S), S);
else if (**s == '/') {
ElementType tmp = TopAndPop(S);
Push(TopAndPop(S) / tmp, S);
}
else
Push(atoi(*s), S);
s++;
}
ElementType x = TopAndPop(S);
DisposeStack(S);
return x;
}
void CalPostFix(unsigned char ope,Stack S)
{
double op1,op2;
if( ope == '+' ){
op2 = TopAndPop( S );
op1 = TopAndPop( S );
Push(op1 + op2, S );
}
else if( ope == '*'){
op2 = TopAndPop( S );
op1 = TopAndPop( S );
Push(op1 * op2, S );
}
else if( ope == '-'){
op2 = TopAndPop( S );
op1 = TopAndPop( S );
Push(op1 - op2, S );
}
else if( ope == '/'){
op2 = TopAndPop( S );
op1 = TopAndPop( S );
Push(op1 / op2, S );
}
}
int main()
{
ArrayStack s;
ElementType i;
ElementType tmp;
s = CreateArrayStack(10);
printf("Print Stack: ");
PrintArrayStack(s);
if(IsEmpty(s)) {
printf("\nEmpty stack.\n");
}
if(IsFull(s)) {
printf("\nFull stack.\n");
}
printf("\n\n");
for(i = 0; i < 10; i++) {
printf("Push %d into stack. \n", i);
Push(i, s);
}
printf("\n\n");
printf("Print Stack: ");
PrintArrayStack(s);
printf("Top of stack: %d\n", Top(s));
if(IsEmpty(s)) {
printf("\nEmpty stack.\n");
}
if(IsFull(s)) {
printf("\nFull stack.\n");
}
printf("\n\n");
for(i = 0; i < 5; i++){
tmp = TopAndPop(s);
printf("Top of stack: %d\n", tmp);
printf("Pop out of stack: %d\n", tmp);
}
printf("\n\n");
printf("Print Stack: ");
PrintArrayStack(s);
if(IsEmpty(s)) {
printf("\nEmpty stack.\n");
}
if(IsFull(s)) {
printf("\nFull stack.\n");
}
printf("Top of stack: %d\n", Top(s));
printf("\n\nMake Empty Stack!\n");
MakeEmpty(s);
if(IsEmpty(s)) {
printf("\nEmpty stack.\n");
}
if(IsFull(s)) {
printf("\nFull stack.\n");
}
DisposeArrayStack(s);
return 0;
}