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 

创新互联公司主营牧野网站建设的网络公司,主营网站建设方案,重庆APP开发公司,牧野h5小程序定制开发搭建,牧野网站营销推广欢迎牧野等地区企业咨询

【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

你是否还在寻找稳定的海外服务器提供商？创新互联www.cdcxhl.cn海外机房具备T级流量清洗系统配攻击溯源，准确流量调度确保服务器高可用性，企业级服务器适合批量采购，新人活动首月15元起，快前往官网查看详情吧


网页标题：【C语言】用线性查找与折半查找的两种方法查找成绩-创新互联
文章源于：http://myzitong.com/article/phppp.html