Category Archives: Snippets

Mix (C++ and Assembly), Snippets

Mix (C++ and Assembly) Program to Add Two 8 bit Numbers

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This blog post will guide you through a C++ program that performs the addition of two numbers using inline assembly. While modern compilers provide high-level arithmetic operations, understanding inline assembly can help in optimizing performance and understanding low-level interactions with the CPU. Let’s explore this step-by-step!

#include<iostream.h>
#include<conio.h>
#include<stdio.h>

void main()
{
    clrscr();
    short int a, b, c;
    
    cout << "Enter First Number: ";
    cin >> a;
    cout << "Enter Second Number: ";
    cin >> b;
    
    asm mov ax, a
    asm mov ah, 00h
    asm mov bx, b
    asm mov bh, 00h
    asm add al, bl
    asm mov c, ax
    
    cout << "Result: ";
    cout << c;
    
    getch();
}
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8086, 8086 TASM, Snippets

8086 Assembly Program to Find Reverse of an Array

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In this blog post, we’ll explore how to reverse an array using an 8086 assembly language program. We will walk through the logic, the step-by-step execution, and provide a working code snippet to illustrate the process.

Overall Process:

  1. The program initializes registers and sets up pointers to the source (ARR) and destination (REV_ARR) arrays.
  2. It processes each element of the original array, copying it in reverse order to the destination array.
  3. After processing all elements, the program terminates, leaving the reversed array in memory.

8086 Assembly Code:

DATA SEGMENT
STR1 DB 01H,02H,05H,03H,04H
STR2 DB 5 DUP(?)
DATA ENDS

CODE SEGMENT
ASSUME CS:CODE, DS:DATA
START:
MOV AX, DATA
MOV DS, AX
LEA SI, STR1
LEA DI, STR2+4
MOV CX, 05H

BACK: CLD
MOV AL, [SI]
MOV [DI], AL
INC SI
DEC DI
DEC CX
JNZ BACK

INT 3
CODE ENDS
END START
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8086, 8086 TASM, Snippets

8086 Assembly Program to Check if String is Palindrome or not

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A palindrome is a word, phrase, or sequence that reads the same forward and backward. This 8086 assembly program determines whether a given string is a palindrome by reversing the string and comparing it to the original.

The program follows these steps:

  1. Initialize the Data Segment: Load the string to be checked.
  2. Reverse the String: Store the reversed string in another memory location.
  3. Compare the Original and Reversed Strings: Use CMPSB to compare byte-by-byte.
  4. Print the Result: Display whether the string is a palindrome or not.
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8086, 8086 TASM, Snippets

Performing Block Transfer using Assembly Language

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In this blog post, we’ll explore how to perform a block transfer using an 8086 assembly language program. The following code snippet demonstrates this process:

DATA SEGMENT
STRING1 DB 01H,02H,03H,04H,05H
STRING2 DB 4 DUP(0)
DATA ENDS

CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START: MOV AX,DATA
MOV DS,AX
MOV ES,AX
LEA SI,STRING1
LEA DI,STRING2
MOV CX,05H
CLD
REP MOVSB
INT 3
CODE ENDS
END START
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Mix (C++ and Assembly), Snippets

Mix (C++ and Assembly) Program to Find Whether Number is Odd or Even

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This C++ program determines whether a given number is even or odd using 8086-style inline assembly. It utilizes the div instruction to divide the number by 2 and then checks the remainder stored in the dx register.

#include<iostream.h>
#include<conio.h>

void main() {
    clrscr();
    int a, res;

    cout << "\n Enter a number";
    cin >> a;

    asm mov ax, a       // Move input number into AX
    asm mov bx, 02h     // Move divisor 2 into BX
    asm div bx          // Divide AX by BX, quotient in AX, remainder in DX
    asm mov res, dx     // Store remainder in res

    if(res == 0) {
        cout << "\n Even";
    } else {
        cout << "\n Odd";
    }

    getch();
}
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Mix (C++ and Assembly), Snippets

Mix (C++ and Assembly) Program to Find Whether Number is Positive or Negative

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This program demonstrates how to use inline 8086 assembly in C++ to determine whether a given number is positive or negative. It’s a great way to understand how conditional branching works at the assembly level.

#include<iostream.h>
#include<conio.h>

void main() {
    clrscr();
    int a;

    cout << "\n Enter a number:";
    cin >> a;

    asm mov ax, 0000h     // Clear AX
    asm mov ax, a         // Move user input into AX
    asm cmp ax, 0000h     // Compare AX with 0
    asm jl less           // Jump to 'less' if AX < 0
    asm jge greater       // Jump to 'greater' if AX >= 0

less:
    cout << "\n Number is negative";
    asm jmp end

greater:
    cout << "\n Number is positive";

end:
    getch();
}
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Mix (C++ and Assembly), Snippets

Mix (C++ and Assembly) Program to Find Square/Cube/Factorial of a Number

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This program demonstrates how to calculate the square, cube, or factorial of a number using 8086 inline assembly in C++. It presents a menu-based approach for the user to choose an operation and performs the calculation using the mul instruction in assembly.

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