用c++ 编程求1！+2！+3！+...+8!

#include <iostream>
using namespace std;

int main() {
    int n = 8;
    int sum = 0;
    int fac = 1;
    for (int i = 1; i <= n; i++) {
        fac *= i;
        sum += fac;
    }
    cout << "1!+2!+3!+...+8! = " << sum << endl;
    return 0;
}

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