C Programming

Program 64) Write a program that will recieve a filename and a line of text as command line arguement and write the text to the file.

This program shows the use of command line arguments. The comman line is
F12_7 TEXT AAAAAA BBBBBB CCCCCC DDDDDD
            EEEEEE FFFFFF GGGGGG

Each word in the command line is an argument to the main and therefore the statement
            fp = fopen (argv [1], "w") ;
opens a file with the name TEXT. The for loop that follows immediately writes the remaining 7 arguments to the file TEXT.

                                   PROGRAM

#inclyde <stdio.h>
main ( )
 {
    FILE *fp ;
    int i ;
    char word [15] ;
    fp = fopen (argv [1], "w") ;
          /*    open file with name arg[1] */

  printf ("\nNo.  of arguments in
                         Command line = %d\n\n", argc) ;
  for (i = 2; i < argc; i++)
     fprintf (fp, "%s", argv[i]) ; /* Write to file argv[i] */
 fclose (fp) ;

 /*  Writing content of the file to screen       */

   printf ("Contents of %s file\n\n", argv[1]) ;
   fp = fopen (argv [1], "r") ;
   for (i = 2; i < argc; i++)
   {
       fscanf (fp, "%s", word) ;
       printf ("%s ", word) ;
   }

   fclose (fp);
   printf ("\n\n") ;

/*     Writing the arguments from memory   */

   for (i = 0; i < argc; i++)
       printf ("%*s \n", i * 5, argv [i]) ;
 }

                            Output

C>F12_7 TEXT AAAAAA BBBBBB CCCCCC DDDDDD
                                         EEEEEE FFFFFF GGGGG

No. of arguments in Command line = 9

Contents of Text file

AAAAAA BBBBBB CCCCCC DDDDDD EEEEEE FFFFFF
                                                                       GGGGGG

C:\C\F12_7.EXE
TEXT
      AAAAAA
                  BBBBBB
                              CCCCCC
                                          DDDDDD
                                                       EEEEEE
                                                                   FFFFFF
                                                                             GGGGGG