C语言程序：计算2!+4!+6!+8!+10!的和

#include <stdio.h>

float factorial(int n) { float result = 1; for (int i = 1; i <= n; i++) { result *= i; } return result; }

float sum(int n) { float s = 0; for (int i = 2; i <= n; i += 2) { s += factorial(i); } return s; }

int main() { printf('sum=%f ', sum(10)); return 0; }