Multiple choice java

Which one of the following syntactic constructs is not a simple expression?





    

      
    
            
  1. 
              
    null
    
    
            
    2. 
            
  2. 
              
    43
    
    
            
    3. 
            
  3. 
              
    x 2
    
    
            
    4. 
            
  4. 
              
    print()
    
    
            
    5. 
      

    


    

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        C
        Correct answer
      

        

          Explanation
          

            
It's a compound expression consisting of simple expression x (variable name), the addition operator ( ), and simple expression 2 (a 32-bit integer literal).


          

        

        

          AI explanation
          

          

              

                
'x 2' — two tokens with no operator between them — is not valid, well-formed syntax at all in typical expression grammars (it's a syntax error, not a legal simple expression), which is why it's the odd one out. 'null', '43', and 'print()' are all syntactically valid simple expressions: a literal, a numeric literal, and a function call expression, respectively, each evaluating to a single value under normal language grammars.




                
    
                    
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