#include "stdio.h"
int Bisearch(int a[],int low,int high,int k);
int main()
{
	int pos,s;
	int a[10]={23,25,27,29,31,33,35,37,39,41};
	printf("请输入你要查找的数\n");
	scanf("%d",&s);
	printf("待查找的数   %d\n",s);
	pos=Bisearch(a,0,9,s);//参数传递弄错了,k和s。
	if(pos==-1)
		printf("没有找到该数\n");
	else
		printf("%d在数组中位置是%d\n",s,pos);
	return 0;
}

/*int Bisearch(int a[],int low,int high,int k)
{
	int mid;
	while(low<=high)
	{
	 mid=(low+high)/2;
	 if(k==a[mid])return mid;
	 else if(k<a[mid])high=mid-1;
	 else low=mid+1;
	}
	return -1;
	
}*/


int Bisearch(int a[],int low,int high,int k)
{
	int mid;
	if(low>high)
		return -1;
	else
	{
		mid=(low+high)/2;
		if(a[mid]==k)
			return mid;
		if(a[mid]<k)	
			return Bisearch(a,mid+1,high,k);		
		else
			return Bisearch(a,low,mid-1,k);	
	}
	
}

函数调用参数之间关系还是把握不是太好。

同时要分辨好数组下标值和数组值的区别。