题解 | #牛牛学数列2#
牛牛学数列2
https://www.nowcoder.com/practice/fc72951f52984f3abd286d82eeffacba
#include <stdio.h>
int main()
{
double n = 0;
scanf("%lf", &n);
//int i = 0;
double sum = 0;
for(; n>0; n--)//从后向前，省去一个变量
{
sum += 1/n;
}
printf("%.6lf", sum);
return 0;
}
