Arguments--Call by Value

#include <stdio.h>

int power(int m, int n);

/* test power function */
main()
{
  int i;

  for (i = 0; i < 10; ++i)
    printf("%d %d %d\n", i, power(2,i), power(-3,i));
  return 0;
}

/* power: raise base to n-th power; n >= 0; version 2 */
int power(int base, int n)
{
  int p;

  for (p = 1; n > 0; --n)
    p = p * base;
  return p;
}

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Concepts: Decrementing loop

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Argument values can be changed inside functions using pointers