按学号由小到大顺序输入学生的学号和成绩,从键盘任意输入一个学号,然后查找其成绩
作者:互联网
#include<stdio.h>
int binsearch(long a[],int n,long x);
int main()
{ const int N=40;
long num[N],x;
int i,n,pos;
float score[N];
printf("please enter the total number:");
scanf("%d",&n);
printf("please enter the total and score:\n");
for(i=0;i<n;i++)
{
scanf("%ld%f",&num[i],&score[i]);
}
printf("please enter the searching number:");
scanf("%ld",&x);
pos=binsearch(num,n,x);
if(pos!=0)
{
printf("score=%4.0f\n",score[pos]);*调用函数已经找到该学号的下标*
}
else
{
printf("not found!\n");
}
return 0;
}
int binsearch(long a[],int n,long x)
{
int mid;
int low=0;
int high=n-1;
while(low<=high)
{
mid=(high+low)/2;
if(x>a[mid])
{
low=mid+1;
}
else if(x<a[mid])
{
high=mid-1;
}
else
{
return mid;*返回的其实是下标*
}
}
return -1;
}
标签:学号,int,mid,long,pos,score,printf,成绩,输入 来源: https://blog.csdn.net/weixin_45721340/article/details/122525717