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 JNZ instruction is executed 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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