Skip to main content

Program 1: Hello World

 **Program 1: Hello World**


```assembly

.model small

.stack 100h


.data

    message db 'Hello, World!', '$'


.code

    main proc

        mov ah, 09h          ; DOS function to print string

        lea dx, message      ; Load effective address of message

        int 21h              ; Call DOS interrupt

        mov ah, 4Ch          ; Exit program

        int 21h

    main endp

end main

```


Explanation:

1. `.model small` and `.stack 100h`: Memory model and stack size definitions.

2. `.data` section: Declares the data segment.

   - `message db 'Hello, World!', '$'`: Defines a null-terminated string.

3. `.code` section: Contains the main code.

   - `mov ah, 09h`: Load DOS function code for printing a string.

   - `lea dx, message`: Load effective address of the message string.

   - `int 21h`: Call DOS interrupt to print the string.

   - `mov ah, 4Ch`: Set the exit code for DOS.

   - `int 21h`: Call DOS interrupt to exit the program.

   


Labels:

Comments

Post a Comment

Popular posts from this blog

6. Generate a YACC specification to recognize a valid arithmetic expression that uses operators +, – , *,/ and parenthesis.

Below is a YACC specification for recognizing valid arithmetic expressions that involve operators (+, -, *, /) and parentheses. I'll explain each line of the code afterward: ```yacc %{ #include <stdio.h> %} %token NUMBER %left '+' '-' %left '*' '/' %% expression: expression '+' expression            | expression '-' expression            | expression '*' expression            | expression '/' expression            | '(' expression ')'            | NUMBER            ; %% int yylex() {     // Code for tokenizing input and returning tokens } void yyerror(const char *s) {     fprintf(stderr, "Error: %s\n", s); } int main() {     yyparse();     return 0; } ``` Now, let's break down the YACC specification line by line: 1. `%{` ... `%}`: This is the C code section where y...
Post a Comment
Read more

ktu 2019 Cse Complier programing Lab Syllabus

 1Design and implement a lexical analyzer using C language to recognize all valid tokens  in the input program. The lexical analyzer should ignore redundant spaces, tabs and  newlines. It should also ignore comments. 2. Implement a Lexical Analyzer for a given program using Lex Tool. 3. Write a lex program to display the number of lines, words and characters in an input text. 4. Write a LEX Program to convert the substring abc to ABC from the given input string. 5. Write a lex program to find out the total number of vowels and consonants from the given  input string. 6. Generate a YACC specification to recognize a valid arithmetic expression that uses  operators +, – , *,/ and parenthesis. 7. Generate a YACC specification to recognize a valid identifier which starts with a letter  followed by any number of letters or digits.   8. Implementation of Calculator using LEX and YACC  9. Convert the BNF rules into YACC form and write code to generat...
Post a Comment
Read more

1, Design and implement a lexical analyzer using C language to recognize all valid tokens in the input program. The lexical analyzer should ignore redundant spaces, tabs and newlines. It should also ignore comments

#include <stdio.h> #include <ctype.h> int main() {     char c;     while ((c = getchar()) != EOF) {         if (isspace(c)) {             // Ignore whitespace, tabs, and newlines             continue;         }         if (c == '/') {             // Check for comments             char nextChar = getchar();             if (nextChar == '/') {                 while ((nextChar = getchar()) != '\n');         ...
Post a Comment
Read more