getchar and putchar, example

#include <stdio.h>

main()

{

int c;

while( (c=getchar())

!= EOF)

putchar(c);

}

How to use this program?

• Use it to type a file like UNIX cat command by
  a.out < file
• Use it to copy files by
  a.out < file1 > file2
  

This is program pg139.c

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