Assembly Program

This assembly program demonstrates a simple menu-driven calculator allowing users to perform addition, subtraction, and integer division on two-digit numbers.

Program Description

The program provides a menu with the following options:

• [1] Addition
• [2] Subtraction
• [3] Integer Division
• [0] Exit

Upon selecting an operation, the program prompts the user to enter two two-digit numbers. After receiving the input, it performs the selected operation and displays the result.

Program Structure

Constants and System Calls

• Defines various constants for system calls and ASCII characters.
• Initializes strings for menu messages, prompts, and new lines.

Sections

1. .data: Contains initialized data such as system call variables, menu messages, and numerical variables.
2. .bss: Contains storage variables for user input.
3. .text: Contains the program's executable code, including the main _start routine and various functions.

Functions

• _start: Entry point of the program. Displays the menu, reads user input, and directs program flow based on the selected option.
• addition: Performs addition of two numbers and displays the result.
• subtraction: Performs subtraction of two numbers and displays the result.
• division: Performs integer division of two numbers and displays the result.
• askUserTwoNumbers: Prompts the user to enter two two-digit numbers, converts them to numerical format, and calls the appropriate operation function.
• convertAnswerToStringandDisplay: Converts the numerical result to a string and displays it.

How to Use

1. Clone the repository or download the assembly file.

2. Assemble the assembly file using NASM:

   nasm -felf64 isaacrr_exer9.asm
   ld isaacrr_exer9.o
   ./a.out

3. Simulate/test the program by providing needed input.