Difference between revisions of "MPLab1 Addition"

Revision as of 23:17, 17 September 2023

.model small 
.stack 100H

Define your data in the data section ( here you can define various data items: variables, constants, strings, arrays

data1 dd 00H 
num1 db 10,13,"Enter the first number: $" 
num2 db 10,13,"Enter the second number: $" 
sum db 10,13,"The sum is :$"

Firstly lexical analyzer creates a program lex.l in the Lex language. Then Lex compiler runs the lex.l program and produces a C program lex.yy.c.
Finally C compiler runs the lex.yy.c program and produces an object program a.out.
a.out is lexical analyzer that transforms an input stream into a sequence of tokens.

A Lex program is separated into three sections by %% delimiters. The format of Lex source is as follows:

{ definitions }
%%

{ rules }

%%
{ user subroutines }

Here

Definitions include declarations of constant, variable and regular definitions.
Rules define the statement of form p1 {action1} p2 {action2}....pn {action}. Where pi describes the regular expression and action1 describes the actions what action the lexical analyzer should take when pattern pi matches a lexeme.
User subroutines are auxiliary procedures needed by the actions. The subroutine can be loaded with the lexical analyzer and compiled separately.

@@ Line 1: / Line 1: @@
 ==32-bit Binary Addition Step by Step ==
-* Specify the size for code, data, and stack segments
+# Specify the size for code, data, and stack segments
 <pre>
 .model small
 .stack 100H
 </pre>
-* Define your data in the data section ( here you can define various data items: '''variables, constants, strings, arrays'''
+# Define your data in the data section ( here you can define various data items: '''variables, constants, strings, arrays'''
-  '''data1 dd 00H <br>num1 db 10,13,"Enter the first number: $" <br>num2 db 10,13,"Enter the second number: $" <br> sum db 10,13,"The sum is :$" '''
+  <pre>
+data1 dd 00H
+num1 db 10,13,"Enter the first number: $"
+num2 db 10,13,"Enter the second number: $"
+sum db 10,13,"The sum is :$"
+</pre>
 ==The function of Lex is as follows:==