# include <stdlib.h>
# include <stdio.h>
# include <string.h>

int main ( int argc, char *argv[] )
{
  char arg1[81];
  char arg2[81];
  char arg3[81];

  int i;

  printf ( "\n" );
  printf ( "  This program expects 4 command line arguments.\n", argc );
  printf ( "  It will prompt the user to input the missing ones.\n" );
  printf ( "\n" );
  printf ( "  Number of command line arguments entered was %d\n", argc );
  printf ( "\n" );

  for ( i = 0; i < argc; i++ ) 
  {
    printf ( "  ARGV[%d] = \"%s\"\n", i, argv[i] );
  }
  printf ( "\n" );
  printf ( "  Do we need to ask the user for missing arguments?\n" );
  printf ( "\n" );
//
//  Did we get argument #1?
//
  if ( argc < 2 )
  {
    printf ( "Enter missing argument #1: " );
    scanf ( "%s", arg1 );
  }
  else
  {
    strcpy ( arg1, argv[1] );
  }
//
//  Did we get argument #2?
//
  if ( argc < 3 )
  {
    printf ( "Enter missing argument #2: " );
    scanf ( "%s", arg2 );
  }
  else
  {
    strcpy ( arg2, argv[2] );
  }
//
//  Did we get argument #3?
//
  if ( argc < 4 )
  {
    printf ( "Enter missing argument #3: " );
    scanf ( "%s", arg3 );
  }
  else
  {
    strcpy ( arg3, argv[3] );
  }

  printf ( "\n" );
  printf ( "  Arguments retrieved from command line or user:\n" );
  printf ( "\n" );
  printf ( "  Argument #1 is \"%s\".\n", arg1 );
  printf ( "  Argument #2 is \"%s\".\n", arg2 );
  printf ( "  Argument #3 is \"%s\".\n", arg3 );

  return 0;
}