PROGRAM 16:
Implement Intermediate code generation for simple expressions.
ALGORITHM:
1.Start
2.Read variables,
3.Open file input.txt and output.text
4.Read the contents of the file input.text and evaluate the expression
5.Close the files
6.Stop
PROGRAM:
#include<stdio.h>
#include<conio.h>
#include<string.h>
char op[2],arg1[5],arg2[5],result[5];
void main()
{
FILE *fp1,*fp2;
fp1=fopen("input.txt","r");
fp2=fopen("output.txt","w");
while(!feof(fp1))
{
fscanf(fp1,"%s%s%s%s",op,arg1,arg2,result);
if(strcmp(op,"+")==0)
{
fprintf(fp2,"\nMOV R0,%s",arg1);
fprintf(fp2,"\nADD R0,%s",arg2);
fprintf(fp2,"\nMOV %s,R0",result);
}
if(strcmp(op,"*")==0)
{
fprintf(fp2,"\nMOV R0,%s",arg1);
fprintf(fp2,"\nMUL R0,%s",arg2);
fprintf(fp2,"\nMOV %s,R0",result);
}
if(strcmp(op,"-")==0)
{
fprintf(fp2,"\nMOV R0,%s",arg1);
fprintf(fp2,"\nSUB R0,%s",arg2);
fprintf(fp2,"\nMOV %s,R0",result);
}
if(strcmp(op,"/")==0)
{
fprintf(fp2,"\nMOV R0,%s",arg1);
fprintf(fp2,"\nDIV R0,%s",arg2);
fprintf(fp2,"\nMOV %s,R0",result);
}
if(strcmp(op,"=")==0)
{
fprintf(fp2,"\nMOV R0,%s",arg1);
fprintf(fp2,"\nMOV %s,R0",result);
}
}
fclose(fp1);
fclose(fp2);
getch();
}
}
Input.txt
+ a b t1
* c d t2
- t1 t2 t
= t ? x
Output.txt
MOV R0,a
ADD R0,b
MOV t1,R0
MOV R0,c
MUL R0,d
MOV t2,R0
MOV R0,t1
SUB R0,t2
MOV t,R0
MOV R0,t
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