fig14_03.c

C程序设计经典教程第5版程序示例,比较适合初级c语言的学生

/* Fig. 14.3: fig14_03.c
   Using command-line arguments */
#include <stdio.h>

int main( int argc, char *argv[] )
{ 
   FILE *inFilePtr;  /* input file pointer */
   FILE *outFilePtr; /* output file pointer */
   int c;            /* define c to hold characters input by user */

   /* check number of command-line arguments */
   if ( argc != 3 ) {
      printf( "Usage: mycopy infile outfile\n" );
   } /* end if */
   else {

      /* if input file can be opened */
      if ( ( inFilePtr = fopen( argv[ 1 ], "r" ) ) != NULL ) {

         /* if output file can be opened */
         if ( ( outFilePtr = fopen( argv[ 2 ], "w" ) ) != NULL ) {

            /* read and output characters */
            while ( ( c = fgetc( inFilePtr ) ) != EOF ) {
               fputc( c, outFilePtr );
            } /* end while */

         } /* end if */ 
         else { /* output file could not be opened */
            printf( "File \"%s\" could not be opened\n", argv[ 2 ] ); 
         } /* end else */

      } /* end if */
      else { /* input file could not be opened */
         printf( "File \"%s\" could not be opened\n", argv[ 1 ] );
      } /* end else */

   } /* end else */

   return 0; /* indicates successful termination */

} /* end main */
   
   

 

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