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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		Scanner input = new Scanner(System.in);
  13.         double num1, num2, result=0;    
  14.         System.out.println("First number: ");
  15.         num1 = input.nextDouble();
  16.         System.out.println("Second number: ");
  17.         num2 = input.nextDouble();
  18.         String operator = "";
  19.         while (operator.isEmpty()) {
  20.           System.out.println("Enter Operator: ");
  21.           operator = input.next();
  22.           switch (operator) {
  23.             case "+" : result = num1 + num2; break;
  24.             case "-" : result = num1 - num2; break;
  25.             case "*" : result = num1 * num2; break;
  26.             case "/" : result = num1 / num2; break;
  27.             default  : System.out.println("Invalid operator: " + operator);
  28.                        operator = "";
  29.            }
  30.            System.out.println("Result is " + result);
  31.         }
  32. 	}
  33. }
Success #stdin #stdout 0.07s 711680KB
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First number: 
Second number: 
Enter Operator: 
Result is 36.0
https://ideone.com/94zs3F
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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