Problem:
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.

Input

The input consists of multiple datasets. Each dataset is given in the following format.

a op b

The input ends with a dataset where op = '?'. Your program should not process for this dataset.

Output

For each dataset, print the value in a line.

Constraints

0 ≤ a, b ≤ 20000

No divisions by zero are given.

Sample Input 1

1 + 2
56 - 18
13 * 2
100 / 10
27 + 81
0 ? 0

Sample Output 1

3
38
26
10
108

Solution in Ruby (judge verdict: Wrong Answer)

class Main
  str = gets.split(" ")
  a = str[0].to_i
  op = str[1]
  b = str[2].to_i
  while true
    case op
    when "+"
      puts a + b
      break
    when "-"
      puts a - b
      break
    when "*"
      puts a * b
      break
    when "/"
      puts a / b
      break
    else
      break
    end
  end
end