阶乘之和c++语言程序

Sure! Here's a C++ program to calculate the sum of factorials:

#include <iostream>

// Function to calculate factorial
int factorial(int n) {
    if (n == 0 || n == 1) {
        return 1;
    } else {
        return n * factorial(n - 1);
    }
}

int main() {
    int num;
    int sum = 0;

    std::cout << "Enter a number: ";
    std::cin >> num;

    for (int i = 1; i <= num; i++) {
        sum += factorial(i);
    }

    std::cout << "The sum of factorials up to " << num << " is: " << sum << std::endl;

    return 0;
}

In this program, we define a `factorial` function to calculate the factorial of a number. We then prompt the user to enter a number and use a loop to calculate the sum of factorials up to that number. Finally, we output the result.