Multiple choice c

The variables in C programming language:





    

      
    
            
  1. 
              
    Must be declared before being used.
    
    
            
    2. 
            
  2. 
              
    Can be used without declaration
    
    
            
    3. 
            
  3. 
              
    Can be used before declaration
    
    
            
    4. 
            
  4. 
              
    none of the above
    
    
            
    5. 
      

    


    

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        A
        Correct answer
      

        

          Explanation
          

            
In C (specifically C89/90 and generally), variables must be declared before use. Modern C (C99) allows mixed declarations, but generally one cannot use a variable before it exists.


          

        

    

  



          

      
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