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#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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