C Program for Receives strings from keyboard and writes them to file

/* Receives strings from keyboard and writes them to file */
#include <stdio.h>
main( )
{
FILE  *fp ;
char  s[80] ;
fp = fopen ( "POEM.TXT", "w" ) ;
if ( fp == NULL )
{
puts ( "Cannot open file" ) ;
exit( ) ;
}
printf ( "\nEnter a few lines of text:\n" ) ;
while ( strlen ( gets ( s ) ) > 0 )
{
fputs ( s, fp ) ;
fputs ( "\n", fp ) ;
}
fclose ( fp ) ;
}