从键盘输入某班学生某门课的学号和成绩（假设每班人数不超过40人），当输入为负值时，表示输入结束，试编程从键盘输入一个学号，查找该学号学生的成绩 

【线性查找】 Linear Search

#include#define N 40
int ReadScore(int score[],long num[]);
int LinSearch(long num[],long x,int n);
int main()
{
	int score[N],n,pos;
	long num[N],x;
	n=ReadScore(score,num);
	printf("Total students are %d\n",n);
	printf("input the searching ID:");
	scanf("%ld",&x);
	pos=LinSearch(num,x,n);
	if(pos!=-1)
	  printf("score=%d",score[pos]);
	else
	  printf("Not found!\n");
	return 0;  
}
int ReadScore(int score[],long num[])
{
	int i=-1;
	do{
		i++;
		printf("please input ID and score:");
		scanf("%ld%d",&num[i],&score[i]);
	}while(num[i]>0&&score[i]>=0);
	return i;
}
int LinSearch(long num[],long x,int n)
{
	int i;
	for(i=0;i

【折半查找】 Binary Search

#include#define N 40
int ReadScore(long num[],int score[]);
int BinSearch(long num[],long x,int n);
int main()
{
	int score[N],n,pos;
	long num[N],x;
	n=ReadScore(num,score);
	printf("Total students is %d!\n",n);
	printf("input the searching ID:\n");
	scanf("%ld",&x);
	pos=BinSearch(num,x,n);
	if(pos!=-1)
	  printf("score=%d",score[pos]);
	else
	  printf("Not found!");
	return 0;
}
int ReadScore(long num[],int score[])
{
	int i=-1;
	do{
		i++;
		printf("please input student is ID and score:\n");
		scanf("%ld%d",&num[i],&score[i]);
	}while(num[i]>0&&score[i]>=0);
	return i;
}
int BinSearch(long num[],long x,int n)
{
	int mid,left=0,right=n-1;
	while(left<=right)
	{
		mid=(left+right)/2;
		if(x>num[mid])
		  left=mid+1;
		else if(x

提示：mid为输入数组的中间数个数，如果不能整除也没关系，前后两个数都可取

用折半查找效率要高一点

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