Simple Arithmetic Calculator in Assembly

This repository contains an assembly language project that performs basic arithmetic operations: addition, subtraction, multiplication, and division. The calculator reads two single-digit numbers from the user, processes the operations, and stores the results.

Features

• Reading Input: Reads two single-digit numbers from the user.
• Arithmetic Operations: Performs addition, subtraction, multiplication, and division.
• Result Storage: Stores the results of the operations in memory for further use.

Code Snippets

Reading Input

The calculator reads the first and second number from the user and converts them from ASCII to hexadecimal.

; Read the first number
LEER:
    MOV AH, 01H ; Service 01H for reading a character
    INT 21H     ; Store the ASCII code of the character in AL
    CMP AL, 30H ; Check if the digit is less than '0'
    JL LEER
    CMP AL, 39H ; Check if the digit is greater than '9'
    JG LEER
    SUB AL, 30H ; Convert ASCII to hexadecimal
    MOV NUM1, AL

; Read the second number
LEER2:
    MOV AH, 01H ; Service 01H for reading a character
    INT 21H     ; Store the ASCII code of the character in AL
    CMP AL, 30H ; Check if the digit is less than '0'
    JL LEER2
    CMP AL, 39H ; Check if the digit is greater than '9'
    JG LEER2
    SUB AL, 30H ; Convert ASCII to hexadecimal
    MOV NUM2, AL

Arithmetic Operations

The calculator performs addition, subtraction, multiplication, and division, and stores the results.

; Addition
ADD AL, NUM1 ; NUM1 + NUM2
MOV SUM, AL  ; Store the result

; Subtraction
MOV AL, NUM1
SUB AL, NUM2 ; NUM1 - NUM2
MOV RES, AL  ; Store the result

; Multiplication
MOV AL, NUM1
MOV CL, NUM2
MUL CL  ; NUM1 * NUM2
MOV MULTI, AL ; Store the result

; Division
MOV AL, NUM1
MOV BL, NUM2
DIV BL ; NUM1 / NUM2
MOV COCI, AL ; Store the quotient
MOV RESI, AH ; Store the remainder

Usage

1. Assemble and link the code using an assembler (e.g., TASM, MASM).
2. Run the executable.
3. Input two single-digit numbers when prompted.
4. The calculator will perform the operations and store the results.

Memory Variables

• NUM1: First number
• NUM2: Second number
• SUM: Result of addition
• RES: Result of subtraction
• MULTI: Result of multiplication
• COCI: Quotient of division
• RESI: Remainder of division