C++ 随笔练习 求和

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>

int main()
{
    int a, b, c;
    scanf("%d%d%d", &a, &b, &c);
    int relust_a = 0;
    int relust_b = 0;
    double relust_c = 0;
    for (int i = 1; i <= a; i++)
    {
        relust_a += i;
    }
    for (int i = 1; i <= b; i++)
    {
        relust_b += i*i;
    }
    for (int i = 1; i <= c; i++)
    {
        relust_c  = relust_c+((double)1 / i);

    }

    printf("%.2f\n", (double)(relust_a + relust_b + relust_c));
    return 0;
}