gistfile1.txt

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#define _CRT_SECURE_NO_DEPRECATE

int stack[100];
int top;

void push(int x){
  top++;
	stack[top] = x;
}

int pop(){
	int temp = stack[top];
	top--;
	return(temp);
}

int main()
{
	char input[13];
	int integer, a, b, result;

	while(1){
		scanf("%s", input);

		if (isdigit(input[0])) {
			integer = atoi(input);
			push(integer);
		}

		if (input[0] == '+'){
			b = pop();
			a = pop();
			push (a+b);
		}
		else{
			if (input[0] == '-'){
				b = pop();
				a = pop();
				push (a-b);
			}
			else{
				if (input[0] == '*'){
					b = pop();
					a = pop();
					push (a*b);
				}
			}
		}

		if (input[0] == 'p'){
			result = pop();
			printf("%d\n", result);
		}
	}
}