Simple Calculator
Write a program which reads two integers a, b and an operator op, and then prints the value of a op b.
The operator op is '+', '-', '*' or '/' (sum, difference, product or quotient). The division should truncate any fractional part.
The input consists of multiple datasets. Each dataset is given in the following format.
a op b
The input ends with a single '?'. Your program should not process for this terminal symbol.
For each dataset, print the value in a line.
0 ≤ a, b ≤ 20000
No divisions by zero are given.