[code#include <stdio.h>
float H(int n,float a)
{
    if(n==1)
        return (a+1);
    else
        return H(n-1,a+1.0/n);
}
int main(void)
{
    int n;
    scanf("%d",&n);
    printf("%f",H(n,0));
    printf("\n");
}][/code]
warning C4244: 'function' : conversion from 'double ' to 'float ', possible loss of data

你在逗我？这样这个递归就废掉了，我知道怎么改了，不过还是谢谢你