While high-level programming languages like C++ make arithmetic operations incredibly simple, delving into inline assembly offers valuable insights into how the CPU processes instructions under the hood. Hence in this post, we’ll walk through a simple program that uses both C++ and inline assembly to add two integer values. Additionally, we will carry out decimal adjust after addition.
Continue reading Mix (C++ and Assembly) Program to Add Two 16 bit Numbers (With DAA)Tag Archives: 8086
Mix (C++ and Assembly) Program to Subtract Two 16-bit Numbers (With DAS)
While modern high-level languages like C++ abstract away many low-level operations, sometimes it’s useful to dive into assembly-level instructions for greater control and understanding. This example demonstrates subtraction using inline assembly in C++, with the addition of the DAS instruction to adjust the result for Binary Coded Decimal (BCD) operations.
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
void main() {
clrscr();
int a, b, c;
cout << "Enter First Number:";
cin >> a;
cout << "Enter Second Number:";
cin >> b;
asm mov ax, a // Move 'a' into AX
asm mov bx, b // Move 'b' into BX
asm sub ax, bx // Subtract BX from AX
asm das // Adjust AX for BCD subtraction
asm mov c, ax // Store result in 'c'
cout << "Result:";
cout << c;
getch();
}
Mix (C++ and Assembly) Program to Subtract Two 16 bit Numbers
While modern high-level languages like C++ abstract away many low-level operations, sometimes it’s useful to get closer to the hardware to understand how things work under the hood. This example demonstrates how to subtract two 16-bit numbers using inline assembly in a simple C++ program.
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
void main() {
clrscr();
int a, b, c;
cout << "Enter First Number:";
cin >> a;
cout << "Enter Second Number:";
cin >> b;
asm mov ax, a // Move 'a' into AX
asm mov bx, b // Move 'b' into BX
asm sub ax, bx // Subtract BX from AX
asm mov c, ax // Store result in 'c'
cout << "Result:";
cout << c;
getch();
}
Mix (C++ and Assembly) Program to Add Two 8 bit Numbers
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();
}
8086 Assembly Program to Find Reverse of an Array
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:
- The program initializes registers and sets up pointers to the source (
ARR) and destination (REV_ARR) arrays. - It processes each element of the original array, copying it in reverse order to the destination array.
- 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 STARTContinue reading 8086 Assembly Program to Find Reverse of an Array
8086 Assembly Program to Check if String is Palindrome or not
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:
- Initialize the Data Segment: Load the string to be checked.
- Reverse the String: Store the reversed string in another memory location.
- Compare the Original and Reversed Strings: Use
CMPSBto compare byte-by-byte. - Print the Result: Display whether the string is a palindrome or not.
Performing Block Transfer using Assembly Language
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 STARTContinue reading Performing Block Transfer using Assembly Language