If Statement Code Generationusing Lex Program

Compiler Construction Lab Manual / If Statement Code Generationusing Lex Program

Program Name

Write a Compiler Construction Program for If Statement Code Generationusing Lex Program.

Theory

If Statement Code Generationusing Lex Program

Program Code


#include<stdio.h>
main()
{
int i,j;
char stmt1[10],stmt2[10];
printf("\nenter the c statement\n");
gets(stmt1);
gets(stmt2);
if(stmt1[0]=='i' && stmt1[1]=='f')
{
printf("\nMOV %c,A",stmt1[3]);
printf("\nMOV %c,R1",stmt1[5]);
printf("\nCMP R1");
printf("\nJGE NEXT");
printf("\nADD %c",stmt1[5]);
printf("\nSTORE A,R1",stmt1[3]);
printf("\nNEXT:\n");
}
}

Saving: vi ab.c

Compiling and Running
cc ab.c
./a.out

Input

Enter the c statement
if(a< b )
a=a+b

Output
MOV a,A
MOV b,R1
CMP R2
JGE NEXT
ADD b <
STORE A,R1
NEXT:

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