Write methods to implement the multiply, subtract, and divide operations for integers. The results of all of these are integers. Use only the add operator.

You should implement following methods:

• Operations()  constructor
• minus(a, b)  Subtraction, returns a - b
• multiply(a, b)  Multiplication, returns a * b
• divide(a, b)  Division, returns a / b

Example:

Operations operations = new Operations();

operations.minus(1, 2); //returns -1

operations.multiply(3, 4); //returns 12

operations.divide(5, -2); //returns -2

Note:

• You can assume inputs are always valid, that is, e.g., denominator will not be 0 in division.
• The number of calls will not exceed 1000.