Simple Calculator(lintcode 478)

Description

Given two integers a and b, an operator, choices:

+, -, *, /

Calculate a < operator > b.

Notice:
Use switch grammar to solve it.

Example

For a = 1, b = 2, operator = +, return 3.

For a = 10, b = 20, operator = *, return 200.

For a = 3, b = 2, operator = /, return 1. (not 1.5)

For a = 10, b = 11, operator = -, return -1.

Interface

public class Calculator {
    /**
      * @param a, b: Two integers.
      * @param operator: A character, +, -, *, /.
      */
    public int calculate(int a, char operator, int b) {
        /* your code */
    }
}

Idea

Nothing important.

Solution

public class Calculator {
    /**
      * @param a, b: Two integers.
      * @param operator: A character, +, -, *, /.
      */
    public int calculate(int a, char operator, int b) {
        /* your code */
        switch (operator) {
            case '+': return a + b;
            case '-': return a - b;
            case '*': return a * b;
            case '/': return a / b;
        }
        return 0;
    }
}