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: Accepted)

class Expression
  def initialize(proc, a, b)
    @proc = proc
    @a = a
    @b = b
  end
  
  def solve
    if @proc == '+'
      @a + @b
    elsif @proc == '-'
      @a - @b
    elsif @proc == '*'
      @a * @b
    elsif @proc == '/'
      @a / @b
    end
  end
end

expressions = Array.new(0)

while true
  expression_array = gets.split
  if expression_array[1] == '?'
    break
  end
  
  a = expression_array[0].to_i
  proc = expression_array[1]
  b = expression_array[2].to_i
  expressions << Expression.new(proc, a, b)
end

expressions.each do |expression|
  puts expression.solve
end