Challenge: Tiny Calculator

Lab C++ Intermediate 20 points

Read a whole number, an operator character (+ - * /) and another whole number, like 8 * 3. Print the result. For / use integer division. If the operator is / and the second number is 0, print cannot divide by zero.

Input

Number, operator and number, separated by spaces.

Output

The result, or the divide-by-zero message.

Example

Input

8 * 3

Output

Sample input available Sample output available

Editor

C++

Hints

Read the operator into a char: cin >> a >> op >> b;

switch (op) with case '+': and so on.

Check b == 0 before dividing.

Solution explanation

A char holds the operator, and switch picks the right calculation.

Show solution

#include <iostream>
using namespace std;

int main() {
    int a, b;
    char op;
    cin >> a >> op >> b;
    switch (op) {
        case '+':
            cout << a + b << "\n";
            break;
        case '-':
            cout << a - b << "\n";
            break;
        case '*':
            cout << a * b << "\n";
            break;
        case '/':
            if (b == 0) {
                cout << "cannot divide by zero\n";
            } else {
                cout << a / b << "\n";
            }
            break;
    }
    return 0;
}

Output

Answer