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Discussion :: Operators and Assignments

  1. What will be the output of the program?

    class SC2 
{    
   public static void main(String [] args)     
   {          
       SC2 s = new SC2();   
       s.start();  
   }    

   void start()    
   {        
      int a = 3;     
      int b = 4;            
      System.out.print(" " + 7 + 2 + " ");           
      System.out.print(a + b);            
      System.out.print(" " + a + b + " ");         
      System.out.print(foo() + a + b + ");     
      System.out.println(a + b + foo());       

   }     

    String foo()     
    {       
       return "foo";  
    } 
 }

    2. A.

    9 7 7 foo 7 7foo
    B.

    72 34 34 foo34 34foo
    C.

    9 7 7 foo34 34foo
    D.

    72 7 34 foo34 7foo

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    Answer : Option D

    Explanation :

    Because all of these expressions use the + operator, there is no precedence to worry about and all of the expressions will be evaluated from left to right. If either operand being evaluated is a String, the + operator will concatenate the two operands; if both operands are numeric, the + operator will add the two operands.

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