#include <stdio.h>

int main ( void )
{
  char line[ 5 ] = { 0 };

  printf ( "Input a string: " );

  if ( NULL == gets ( line ) )    //违背1
  {
    printf ( "gets error\n" );

    return ( -1 );
  }
  else
  {
    printf ( "The line entered was: %s\n", line );
  }

  return ( 0 );
}