Challenge: Design a Calculator

Problem statement

The aim of this challenge is to design a calculator that takes operands in its input and performs one of the following operations on them:

• Addition
• Subtraction
• Multiplication
• Division

test function

You have to write a function test that takes two values of type double and one value of type char in its input parameters.

• number1 and number2 take the values of the operands.

• operate can take $+$, ...