#include <stdio.h>
#include<ctype.h>
int stack[20];
int top=-1;
void push(int);
int pop();
int main(void) {
char exp[20],*e;
int n1,n2,n3,num;
printf("Enter the postfix expression:");
scanf("%s",exp);
e=exp;
while(*e!='\0')
{
if(isdigit(*e))
{
num=*e-48;
push(num);
}
else
{
n1=pop();
n2=pop();
switch(*e)
{
case '+':
n3=n1+n2;
break;
case '-':
n3=n2-n1;
break;
case '*':
n3=n2*n1;
break;
case '/':
n3=n2/n1;
break;
}
push(n3);
}
e++;
}
printf("Result=%d",pop());
return 0;
}
void push(int x)
{
stack[++top]=x;
}
int pop()
{
return stack[top--];
}