实现一维数组的遍历输出，要求用五种不同的语句输出五次。

#include <stdio.h>
#define N 10
void main(void)
{
	int a[N] = {-2, -1, 0, 1, 3, 4, 7, 9, 13, 17};
	int i,low=0,high=N-1,mid,ret=-1;
	
	int key;

	//输入数据
	scanf("%d",&key);
	while(low <= high)
	{
    mid = low + (high-low)/2;
    if(a[mid] == key) 
    {ret=mid;break;}
    else if(a[mid] > key)
        {high=mid-1;continue;}
    else
        {low=mid+1;continue;}
}
	printf("%d ",ret);
}