How many times JNZ instruction is executed in the following program? MVI C, 20H LOOP: DCR C JNZ LOOP A) 20 B) 30 C) 32 D) 40
Question
How many times does the JNZ instruction execute in the following program?
MVI C, 20H
LOOP: DCR C
JNZ LOOP
- A) 20
- B) 30
- C) 32
- D) 40
Solution
The JNZ (Jump if Not Zero) instruction in the given assembly language program is executed as long as the value in the C register is not zero.
The program starts by moving the value 20H (which is 32 in decimal) into the C register.
Then it enters a loop where it decrements the value in the C register by 1 and then checks if the value is zero.
If the value is not zero, it jumps back to the start of the loop.
This continues until the value in the C register is zero, at which point the JNZ instruction is not executed and the program ends.
So, the JNZ instruction is executed 32 times, which corresponds to option C) 32.
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