题解 | #牛牛学数列2#

#include <stdio.h>

int main() {
    int a = 0;
    scanf("%d",&a);
    double num = 0.0;
    for (int i = 1; i <= a; i++)
    {
        num += 1.0 / i;
    }

    printf("%lf",num);
    return 0;
}