Functions

#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 */
int power(int base, int n)
{
  int i, p;

  p = 1;
  for (i = 1; i <= n; ++i)
    p = p * base;
  return p;
}

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Concepts: Definitions, declarations, parameters, arguments & prototypes; the return statement

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Shorthand: p = p * base; can be written p *= base;