#include <iostream>
#include <stack>
#include <cctype>
using namespace std;
int main() {
string exp;
stack<int> s;
cout << "Enter postfix expression: ";
cin >> exp;
for (int i = 0; i < exp.length(); i++) {
char ch = exp[i];
// If character is a number
if (isdigit(ch)) {
s.push(ch - '0');
}
else {
// Get second operand
int b = s.top();
s.pop();
// Get first operand
int a = s.top();
s.pop();
// Perform operation
if (ch == '+') {
s.push(a + b);
}
else if (ch == '-') {
s.push(a - b);
}
else if (ch == '*') {
s.push(a * b);
}
else if (ch == '/') {
s.push(a / b);
}
}
}
cout << "Result = " << s.top();
return 0;
}
