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15 January, 2009

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
#include
#include
#include
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();
}

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