Multiple choice assembly

To increment both AL, AH registers:





    

      
    
            
  1. 
              
    INC AX
    
    
            
    2. 
            
  2. 
              
    INC AL INC AH
    
    
            
    3. 
            
  3. 
              
    both (a) and (b) are correct
    
    
            
    4. 
            
  4. 
              
    both (a) and (b) are wrong
    
    
            
    5. 
      

    


    

      Reveal answer
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        B
        Correct answer
      

        

          Explanation
          

            
In 8086 assembly, 'INC AX' increments the 16-bit AX register as a single unit. To increment the 8-bit high (AH) and low (AL) parts individually, you must use separate instructions: 'INC AL' and 'INC AH'. Note that 'INC AX' might produce a different result if AL overflows.


          

        

    

  



          

      
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