Thread: How to evaluate a postfix|prefix expression using stack?

can somebody help me bout this?

Code:

void postfix()
{ stack *A;
char a[100];
int a;
clrscr();
create_stack(A);
p("Enter a postfix expression: ");
s("%s",&a)

for(x=0;x<strlen(a);x++)
{if(x[a]>='0'&&x[a]<='9')
    push(A,a[x]);
 else
 pop(A);

}