This document explains the implementation of if-else conditional statements in assembly language using conditional jumps. Key components include the 'cmp' instruction for value comparison and various jump instructions like 'je', 'jne', 'jg', and 'jl' for controlling program flow. An example is provided to demonstrate equality checking between two numbers and how the outcome is stored in a variable.

1. Understanding IF-ELSE in
Assembly Language
Conditional Statements in Low-Level
Programming

2. Introduction to Conditional Statements
Assembly language uses conditional jumps for decision-
making.
IF-ELSE logic is implemented using:
- CMP (Compare): Compares two values.
- JUMP instructions: Directs program flow based on
comparison.
Key Jump Instructions:
- JE (Jump if Equal), JNE (Jump if Not Equal)
- JG (Jump if Greater), JL (Jump if Less), etc.

3. Syntax of IF-ELSE in Assembly
General IF-ELSE structure:
CMP operand1, operand2 ; Compare values
JE label_if_equal ; Jump if equal
; ELSE part
MOV AX, 0 ; Code for ELSE
JMP end_if
label_if_equal:
MOV AX, 1 ; Code for IF condition
end_if:

4. Example Code
Task: Check if two numbers are equal.
MOV AX, 5 ; Load 5 into AX
MOV BX, 5 ; Load 5 into BX
CMP AX, BX ; Compare AX and BX
JE Equal ; Jump if equal
MOV CX, 0 ; ELSE: Set CX = 0
JMP End
Equal:
MOV CX, 1 ; IF: Set CX = 1
End:
Explanation:
- If AX = BX, CX becomes 1.
- Else, CX remains 0.

5. Key Points & Summary
CMP: Compares values, does not modify operands.
JUMP Instructions control flow after comparison.
IF-ELSE logic enables decision-making in Assembly.
Efficient and direct implementation using minimal
instructions.