Challenge: Tiny Calculator

Lab C Intermediate 20 points

Read a whole number, an operator (+ - * /) and another whole number, like 6 * 7, and print the result. For / use whole-number division. If the operator is / and the second number is 0, print Cannot divide by zero.

Input

A number, a space, an operator, a space, a number.

Output

The result, or the error message.

Example

Input

6 * 7

Output

Sample input available Sample output available

Editor

Hints

scanf("%d %c %d", &a, &op, &b) reads all three parts.

A switch on op is a neat fit.

Check b == 0 before dividing.

Solution explanation

The switch picks the right calculation; inside the / case an if protects us from dividing by zero.

Show solution

#include <stdio.h>

int main() {
    int a, b;
    char op;
    scanf("%d %c %d", &a, &op, &b);
    switch (op) {
        case '+':
            printf("%d\n", a + b);
            break;
        case '-':
            printf("%d\n", a - b);
            break;
        case '*':
            printf("%d\n", a * b);
            break;
        case '/':
            if (b == 0) {
                printf("Cannot divide by zero\n");
            } else {
                printf("%d\n", a / b);
            }
            break;
    }
    return 0;
}

Output

Answer