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Sidetrack: Standard I/O Streams, Redirects

Standard file streams:
  • stdin … standard input, by default: keyboard
  • stdout … standard output, by default: screen
  • stderr … standard error, by default: screen

  • fprintf(stdout, …) has the same effect as printf(…)
  • fprintf(stderr, …) often used to print error messages
Executing a C program causes main(…) to be invoked
  • with stdin, stdout, stderr already open for use