Demonstration to uncomment the “C” program.

#include 
main (int argc, char *argv[] )
{
	int i = 1 , flag = 0 , quote = 0;
	char buf[100][80];
	int printflag = 1, end_cmt = 0 ,begin_cmt = 1 ;
	if ( argc != 3 )
	{
		fprintf ( stderr ," Usage : a.out  \n" );
		exit (0 );
	}
	FILE *fp ;	
	int line = 0, index = 0 ;
	if ( (fp = fopen ( argv[1] , "r" )) == NULL )
	{
		fprintf ( stderr ,"File not found\n");
		exit ( 1);
	}
	while ( i )
	{
		i = fgetc ( fp );
		if ( i == EOF )
			break;
		buf[line][index] = i ;
		index++;
		if ( buf[ line ][ index - 1 ] == '\n' )
		{
			line++ ;
			index = 0;
		}
	}
	fclose ( fp );
	buf[ line ][ ++index] = i ;
	line = 0;
	index = 0;
	fp = fopen (argv[2] , "w" );
	while ( 1 )
	{
		if ( buf[ line ][ index ] == '"' && quote == 0 )
		quote = 1;
		else if ( buf[ line ][ index ] == '"' && quote == 1 )
		quote = 0;
		
		if ( quote == 0 && buf[ line ][ index] == '/' && 
		buf[ line ][ index + 1 ] == '*' )
		{
			begin_cmt = 1;
			index += 2;
			continue;
		}
		else 
		if ( quote == 0 && begin_cmt == 1 && buf[ line ][ index ] == '*'
		&& buf[ line ][ index + 1 ] == '/' )
		{
			begin_cmt = 0;
			index += 2 ;
			continue ;
		}
		else if ( quote == 0 && buf[ line ][ index ] == '/' &&  
		buf[ line ][ index + 1 ] == '/' )
		{
			if (begin_cmt ==  1 )
			begin_cmt = 2;
			else
			begin_cmt = 3;
			index += 2;
			continue;
		}
		fprintf ( fp ,"%c", buf [ line ][ index ] );
		index++;
		if ( buf[ line ][ index - 1 ] == '\n' &&  (begin_cmt == 2 ||
		begin_cmt == 3 ) )
		{
			line++ ;
			if ( begin_cmt == 3)
			begin_cmt = 0;
			else
			begin_cmt = 1;
			index = 0;
		}		
		else if ( buf[ line ][ index - 1 ] == '\n' )
		{
			line++ ;
			index = 0;
		}
		if ( buf [line][index] == EOF )
		break;
	}
	fprintf ( fp , "\n\n");
	fclose ( fp );
}

Note: This program works well in UNIX environment.

Code contributed by : Pradeep SP
pradeepcse23@gmail.com