C语言函数实现三位数组合计算

#include <stdio.h> int fun(int n); int main() { int n; scanf("%d", &n); printf("\n可组成%d个不同的3位数", fun(n)); return 0; }

int fun(int n) { int cnt = 0; for (int i = 1; i <= n; i++) { for (int j = 1; j <= n; j++) { for (int k = 1; k <= n; k++) { if (i != j && j != k && i != k) { printf("%d%d%d,", i, j, k); cnt++; } } } } return cnt; }