#include<stdio.h>
float _sum(float _count);
float sum(float count);
int main(void)
{
    int total,total_num;
    float res,_res;
    printf("Please enter 2 times:");
    while(scanf("%d%d",&total,&total_num)==2)
    {
        if(total<=0 || total_num<=0)
         break;
        _res= _sum(total_num);
        res=sum(total);
        printf("_sum:The sum of %d items is %f.\n",total_num,_res);
        printf("sum:The sum of %d items is %f.\n",total,res);
        printf("Please enter next 2 times:");
    }
    printf("Bye!\n");
    return 0;
}
float _sum(float _count)
{
    float i;
    float _num=1.0,t_sum=0;
    for(i=2;i<_count;i+=1.0)
    {
        i=_num/i;
        t_sum+=i;
    }
    return t_sum+1.0;
}
float sum(float count)
{
    float j;
    float num=1.0,tsum=0;
    for(j=2;j<count;j+=1.0)
    {
        if((int)j%2==0)
         j=-(num/j);
        else
         j=num/j;
        tsum+=j;
    }
    return tsum+1.0;
}

[此贴子已经被作者于2019-1-19 18:32编辑过]

嗯。这个我知道了。能不能帮我看看这个？谢谢

已经解决了。