Simple calculator X97965

Statement

Write a function @calculator(a, b, operator)@ to compute simple arithmetic expressions. The function receives as arguments two numbers $a$ and $b$ and a character @operator@ that is always either ’+’, ’-’ or ’*’. The function has to return either the addition $a + b$ , substraction $a - b$ or the multiplication $a*b$ depending on the actual value of @operator@.

Sample session

>>> calculator(3.2, 5, '+')
8.2
>>> calculator(2, 3 + 1/2, '-')
-1.5
>>> calculator(1/2, 4, '*') - calculator(1, 1, '+')
0.0

Information

Author: ProAl
Language: English
Official solutions: Python
User solutions: Python