C Program to Remove Comments and Blank lines from a valid C Program

This program accepts any valid C Program as an input and removes the comments and blanks from it. The output is a program that has no comments and blank lines.

#include<stdio.h>

#include<conio.h>

#include<process.h>

#include<dos.h>

void main()

{
FILE *a,*b;

char fname[20],ch,tch=NULL,tch1=NULL;

int flag1=0,flag=0,count=0,count1=0,count2=0;
clrscr();

printf(“Enter the file name (.C or .TXT)\n”);

gets(fname);

a=fopen(fname,”r”);

if(a==NULL)

{

puts(“Cannot open the source file!!!”);

delay(500);

exit(1);

}

b=fopen(“target.c”,”w”);

if(b==NULL)

{

puts(“Cannot create target file!!!”);

delay(500);

exit(1);

}
while(1)

{

ch=fgetc(a);

if(ch==EOF) break;
else

{
if(ch==’\n’)

{

count1=1;

tch1=ch;

continue;

}
else if(ch==’\n’&& count1==1)

continue;

else if(ch==’/'&&count==0)

{

flag1=1;

tch=ch;

count=1;

continue;

}
else if(ch==’*'&& flag1==1)

{

flag=1;

flag1=0;

tch=NULL;

}
else if(ch==’*'&&flag==1)

{

count2=1;

count=1;

continue;

}
else if(ch==’/'&&count2==1)

{

flag=0;

count=0;

tch=NULL;

continue;

}
else if(count==1&&flag==1)

count=0;
else if(flag1==1)

flag1=0;

}
if(flag!=1)

{

if(tch>0)

fputc(tch,b);

if(tch1>0)

fputc(tch1,b);

tch1=NULL;

tch=NULL;

count=0,count1=0,count2=0;

fputc(ch,b);

flag1=0,flag=0;

}
}
puts(“DONE!! OP FILE IS \”TARGET.C\”\n”);

fcloseall();

getch();

}