求助，测试点2 3 4 不过

#include<stdio.h>
int main()
{
	int i,n,k,a=0,b=0,sum1=0,sum2=0;
	double average1,average2;
	scanf("%d%d",&n,&k);
	while(n<1||n>10000||k<1||k>100)
	{
		scanf("%d%d",&n,&k);
	}
	for(i=1;i<=n;i++)
	{
		if(i%k==0)
		{
			a++;
		    sum1=sum1+i;
		}
		else
		{
			b++;
		    sum2=sum2+i;
		}
	}
	average1=sum1/a;
	average2=sum2/b;
	printf("%.1lf %.1lf",average1,average2);
	return 0;
}