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 JAVA (judge verdict: Accepted)

import java.util.Scanner;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String op;
    int a;
    int b;
    int sum = 0;
    int dec = 0;
    int multi = 0;
    int div = 0;

    do{
       a = sc.nextInt();
       op = sc.next();
       b = sc.nextInt();

    if(op.equals("+")){
       sum = a+b;
       System.out.println(sum);
    }else if(op.equals("-")){
       dec = a-b;
       System.out.println(dec);
    }else if(op.equals("*")){
       multi = a*b;
       System.out.println(multi);
    }else if(op.equals("/")){
      switch(b){
        case 0:
        break;
      default:
       div = a/b;
       System.out.println(div);
      }
    }
  }while(!(op.equals("?")));
  sc.close();
  }
}