File Copying

#include <stdio.h>

/* copy input to output; 1st version */
main()
{
  int c;

  c = getchar();
  while (c != EOF) {
    putchar(c);
    c = getchar();
  }
}

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Concepts: Text streams; getchar() & putchar()

#include <stdio.h>

/* copy input to output; 2nd version */
main()
{
  int c;

  while ((c = getchar()) != EOF)
    putchar(c);
}

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Concepts: Assignments in expressions