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

Submitted by Srikanth on Saturday, 24 November 200710 Comments

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();

}

10 Comments »

Abhijeet said:

Hi!I am browsing this web site from last two month , i want to suggest one thing that new information should be added every week because computer field has huge and interesting knowledge.

- 19 November 2009 at 6:58 PM

Karthikeyan said:

i am using this website for last two days . This website is very interesting.

- 1 December 2009 at 6:05 PM

Srikanth (author) said:

thanks for your suggestion.. Will try to update my blog freequently.

- 4 December 2009 at 10:30 PM

KISHORE said:

HEY man you are great, how do you know all these things…………???????

- 13 June 2010 at 7:07 PM

abhi said:

HE i want borland c++ compiler 5.5 for free
Plz tell me the exact link where i can get it

I hve tried codegear website but i m not able 2 find where i can can it for free!!!

kindly help!!!

- 15 June 2010 at 6:14 PM

abhi said:

Thanx

- 15 June 2010 at 6:15 PM

abhi said:

I want borland c++ compiler 5.5
i hve turbo c++ but it is a 16 bit compiler
i want to change my software’s icon so can u tell me the exact URL for that???
plz help me I have tried codegear.com but i m not able 2 find it for free!!!
help me!!

- 15 June 2010 at 6:34 PM

Sandeep Kumbhar said:

Hey hi shri…
I learned many things cos of your web site buddy…kindly thanks a lot…!!!

- 20 January 2011 at 6:29 PM

Rashmi said:

The info provided by u is awesome n damn helpful.
Thanks a lot…

- 31 March 2011 at 6:30 PM

raju said:

very big program but i will try

- 25 July 2011 at 12:45 AM

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