Ch 03: Branching, Loops and Program Flow

Examines program control flow in assembly, flag register evaluation (ZF, CF, SF, OF), relative displacement jumps, implementing loops, and bubble sort sorting algorithms in assembly.

261 Questions261 MCQs0 Short Questions0 Long Questions

🎯 Exam Practice Papers

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Timed practice exam simulation for CS401 - Computer Architecture and Assembly Language Programming.

Showing 241 – 250 of 261 Questions

Page 25 of 27

Q241

❓ MCQ📘 CS401📑 Lec 3🏷️ 3.1. Conditional JumpsEasy🔁⭐💡📄🎓VU🏛️VU

Which conditional jump instruction is taken if the last arithmetic operation produced a zero in its destination, or after CMP if both operands were equal?

💻 assembly Snippet

cmp ax, bx
je match_label  ; Jumps if AX == BX (ZF = 1)

A.Jump if Zero (JZ) / Jump if Equal (JE)
B.Jump if Equal (JE) only
C.Jump if Zero (JZ) only
D.No jump for this condition

Q242

📝 Short Q📘 CS401📑 Lec 3🏷️ 3.1. Conditional JumpsEasy⭐💡📄🎓VU🏛️VU

How does the CMP (Compare) instruction operate in 8086 assembly language, and how does it update processor status flags compared to the SUB instruction?

💻 assembly Snippet

; CMP vs SUB Example
mov ax, 24
cmp ax, 12    ; Calculates 24 - 12 = 12; Sets ZF = 0, AX remains 24
sub ax, 12    ; Calculates 24 - 12 = 12; Sets ZF = 0, AX becomes 12

Q243

📝 Short Q📘 CS401📑 Lec 3🏷️ 3.1. Conditional JumpsMedium⭐💡📄🎓VU🏛️VU

Explain the operational logic of the JNE (Jump if Not Equal) / JNZ (Jump if Not Zero) conditional branch instruction and its reliance on the Zero Flag (ZF).

💻 assembly Snippet

; Conditional Branching with JNE
mov ax, 24
cmp ax, 12          ; Operands unequal -> ZF = 0
jne target_address  ; Jump taken because ZF == 0

Q244

📝 Short Q📘 CS401📑 Lec 3🏷️ 3.1. Conditional JumpsEasy⭐💡📄🎓VU🏛️VU

What is the JNZ (Jump if Not Zero) instruction in 8086 assembly language, and how does its execution depend on the status of the Zero Flag (ZF)?

💻 assembly Snippet

; JNZ Conditional Branching Example
mov ax, 5
sub ax, 2     ; Result = 3 (Non-zero -> ZF = 0)
jnz loop_body ; Jump taken because ZF == 0

Q245

📝 Short Q📘 CS401📑 Lec 3🏷️ 3.1. Conditional JumpsMedium⭐💡📄🎓VU🏛️VU

How are comparison operations and conditional branching used in assembly language to emulate high-level relational and boolean control logic?

💻 assembly Snippet

; High-level Relational Logic in Assembly
cmp ax, bx       ; Compare AX and BX (sets ZF, CF, SF, OF flags)
jg ax_is_greater ; Branch if AX > BX (Signed Greater)

Q246

📝 Short Q📘 CS401📑 Lec 3🏷️ 3.1. Conditional JumpsEasy⭐💡📄🎓VU🏛️VU

How does the CMP (Compare) instruction function in 8086 assembly language, and why is it described as a non-destructive subtraction operation?

💻 assembly Snippet

; CMP Instruction Example
cmp ax, bx    ; Calculates AX - BX, sets flags, preserves AX and BX
je values_equal ; Jump if ZF = 1 (AX == BX)

Q247

📝 Short Q📘 CS401📑 Lec 3🏷️ 3.1. Conditional JumpsMedium⭐💡📄🎓VU🏛️VU

Explain how the Carry Flag (CF), Zero Flag (ZF), Sign Flag (SF), and Overflow Flag (OF) reflect relations between operands during a CMP operation.

💻 assembly Snippet

; Status Flags after CMP
cmp ax, 10    ; If AX = 10 -> ZF=1, CF=0
              ; If AX = 5  -> ZF=0, CF=1 (Borrow required)
              ; If AX = 15 -> ZF=0, CF=0

Q248

📝 Short Q📘 CS401📑 Lec 3🏷️ 3.1. Conditional JumpsMedium⭐💡📄🎓VU🏛️VU

What is the key difference between conditional jump instructions used for signed comparisons (JG/JL) and unsigned comparisons (JA/JB) in x86 assembly?

💻 assembly Snippet

; Signed vs Unsigned Branching Example
cmp ax, bx
jg signed_greater   ; Signed comparison: branches if AX > BX (Signed)
ja unsigned_above   ; Unsigned comparison: branches if AX > BX (Unsigned)

Q249

📝 Short Q📘 CS401📑 Lec 3🏷️ 3.1. Conditional JumpsEasy⭐💡📄🎓VU🏛️VU

How do JZ (Jump if Zero) and JNZ (Jump if Not Zero) conditional jump instructions operate following a CMP operation?

💻 assembly Snippet

; JZ and JNZ Example
cmp ax, bx
jz values_are_equal    ; Jumps if AX == BX (ZF == 1)
jnz values_are_unequal  ; Jumps if AX != BX (ZF == 0)

Q250

📝 Short Q📘 CS401📑 Lec 3🏷️ 3.1. Conditional JumpsMedium⭐💡📄🎓VU🏛️VU

Why does Intel assembly language provide instruction aliases (synonyms) such as JE/JZ, JNE/JNZ, and JB/JNAE/JC, and how do they map to machine code opcodes and status flags?

💻 assembly Snippet

; Instruction Mnemonic Aliases
cmp ax, bx
je targets_equal   ; Assembly alias for JZ (Opcode 74h)
cmp ax, bx
jz targets_zero    ; Same opcode as JE (Opcode 74h)

Ch 03: Branching, Loops and Program Flow

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

Final Term Examination

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

Final Term Examination

📖 Related CS401 - Computer Architecture and Assembly Language Programming Curriculum Units