Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario descargar pdf (Pagina 60)

Chapter 4

!"  $ "

4-8

* Now, as long as we have files on the command line to process,

* open them, read them, and output them to standard output.

for ( i = 1; i < argc; i++ )

{

* Remember, fopen() returns a file pointer. If the file

* pointer returned points to NULL, the file couldn’t be

* opened. Exit and tell the user why.

infil = fopen ( argv[i], “r” );

if ( infil == NULL )

{

fprintf ( stderr,

“*** cat: unable to open %s. Aborting\n”,

argv[i] );

exit ( errno );

}

* Now loop to get all the characters in the input file and

* put them on the output file [“stdout” for “putchar()”].

while ( ( c = getc ( infil ) ) != EOF )

putchar ( c );

* Done with this file. Close it and get the next one...

fclose ( infil );

}

* Done with all the command line arguments, so done with this

* program!

exit ( 0 );

}

When you are familiar with the programming environment, proceed to any

of the chapters listed below.

If you want to: Go to:

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'#   "! #"! " '#      ! 

#" %"     " 

" 

!"! " " #" ! &!  #! " " "

"   '     !

" 

!"! !   " #" " 

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario Pagina 60