C Program for File encryption utility

/* File encryption utility */
#include "stdio.h"
main( )
{
encrypt( ) ;
}
encrypt( )
{
FILE  *fs, *ft ;
char   ch ;
fs = fopen ( "SOURCE.C", "r" ) ;  /* normal file */
ft = fopen ( "TARGET.C”, "w" ) ;  /* encrypted file */
if ( fs == NULL || ft == NULL )
{
printf ( "\nFile opening error!" ) ;
exit ( 1 ) ;
}
while ( ( ch = getc ( fs ) ) != EOF )
  putc ( ~ch, ft ) ;
fclose ( fs ) ;
fclose ( ft ) ;
}