给定正整数n，求不大于n的正整数的阶乘的和（即求1!+2!+3!+...+n!），输出阶乘的和。C++简写只能用<iostream> 只能用int创建变量
```cpp #include <iostream> int main() { int n; std::cin >> n; int sum = 0; int factorial = 1; for (int i = 1; i <= n; i++) { factorial *= i; sum += factorial; } std::cout << sum; return 0; } ``` 这段C++代码实现了计算不大于输入正整数`n`的正整数阶乘之和的功能。首先从用户输入读取`n`的值，然后使用`for`循环从1到`n`进行迭代，在每次迭代中计算当前数的阶乘并累加到`sum`中，最后输出阶乘的和。 [2026-01-03 16:11:23 | AI问答 | 170点数解答]
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