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Link: http://codepad.org/o39Yp0oh    [ raw code | fork ]

C, pasted on Jan 6:
#include <stdio.h>
#define ERROR 0

int kaijou(int n) {
  if (n < 0)
    return ERROR;
  if (n >= 1)
    return n*kaijou(n-1);
  else
    return 1;
}

int kaijou_2(int n) {
  int res = 1;
  int i;

  if (n < 0)
    return ERROR;
//↓いらないが一応
  if (n == 0)
    return 1;

  for (i = 1 ; i <= n ; i++)
    res *= i;

  return res;
}

int main(void) {
  int x;
  scanf("%d" , &x);
  printf("\n%d" , kaijou(x));
  printf("\n%d" , kaijou_2(x));
}


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