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: Wrong Answer)

import java.util.Scanner;
public class Main {
  public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    int a,b,A;
    String op;
    String str1="+";
    String str2="-";
    String str3="*";
    String str4="/";
    String str5="?";
    a=scan.nextInt();
    op=scan.next();
    b=scan.nextInt();

    if(op.equals(str1)){
      A=a+b;
      System.out.println(A);
    }  else if(op.equals(str2)){
      A=a-b;
        System.out.println(A);
      }else if(op.equals(str3)){
        A=a*b;
      System.out.println(A);
    }else if(op.equals(str4)){
      A=(int)a/b;
      System.out.println(A);
    }else if(op.equals(str5)){
System.out.print("\n");
    }

  }
}