Question

9) Choose the correct Assembly Language code that will do the following: If dog is equal to cat THEN go to LOOP_A ELSE go to LOOP_B if(dog == cat) goto LOOP_A else goto LOOP_B Question 9 options:

cmp cat,dog

jnz LOOP_A

jmp LOOP_B

mov AX,cat

cmp AX,dog

jz LOOP_A

jmp LOOP_B

mov AX,dog

cmp AX,cat

js LOOP_A

jmp LOOP_B

mov AX,cat

cmp AX,dog
js LOOP_A

jmp LOOP_B

Answer 1

the cmp instruction compares the two values by subtracting them and sets the zero flag if both are equal

using this property we will make a jump to Loop_A using the JZ instruction which jumps to the given location if zero flag is set.

hence the correct option should be

mov AX,cat

cmp AX,dog

jz LOOP_A

jmp LOOP_B

here , we 1st move the value of cat to accumulator and then compare the accumulator with dog.

if they are equal the zero flag will be set and control will move to LOOP_A else it will do an unconditional jump to LOOP_B.