UGC NET CS 2014 Dec – paper-3
September 19, 2024UGC NET CS 2014 Dec – paper-3
September 19, 2024UGC NET CS 2014 Dec – paper-3
| Question 5 |
How many times will the following loop be executed ?
LXI B, 0007 H
LOP : DCX B
MOV A, B
ORA C
JNZ LOP
LXI B, 0007 H
LOP : DCX B
MOV A, B
ORA C
JNZ LOP
| 05 | |
| 07 | |
| 09 | |
| 00 |
Question 5 Explanation:
LXI B, 0007 H // Load register pair B with value (00)H and C with value (07)H
LOP :
DCX B // Decrement register pair BC i.e. decrease C because B is already 0.
MOV A, B // Move value of B to A. It means A is 0 after first iteration of loop LOP.
LOP :
DCX B // Decrement register pair BC i.e. decrease C because B is already 0.
MOV A, B // Move value of B to A. It means A is 0 after first iteration of loop LOP.
ORA C // It means perform OR operation between register A and C and store the result into register A. So A = (06)H after first iteration of loop.
JNZ LOP // Jump to LOP if it is not zero.
So this way LOP will be executed 7 times.
Correct Answer: B
Question 5 Explanation:
LXI B, 0007 H // Load register pair B with value (00)H and C with value (07)H
LOP :
DCX B // Decrement register pair BC i.e. decrease C because B is already 0.
MOV A, B // Move value of B to A. It means A is 0 after first iteration of loop LOP.
LOP :
DCX B // Decrement register pair BC i.e. decrease C because B is already 0.
MOV A, B // Move value of B to A. It means A is 0 after first iteration of loop LOP.
ORA C // It means perform OR operation between register A and C and store the result into register A. So A = (06)H after first iteration of loop.
JNZ LOP // Jump to LOP if it is not zero.
So this way LOP will be executed 7 times.
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