C语言-二分法

#include <stdio.h>
#define N 10
void main()
{
    int n,top,bot,mid,i;
    int a[N];     
    for(i=0;i<N;i++) scanf("%d",&a[i]);     //输入N个数
    printf("\nPlease enter the number you are looking for:");
    scanf("%d",&n);                //输入要寻找的数  
    top = 0;
    bot = N;
    while(top<=bot){
        mid = (top+bot)/2;
        if(n<a[mid]) bot = mid-1;
        else if(n>a[mid]) top = mid+1;
        else break;        
    }
    if(top>bot) printf("%d Don't find!!!'",n);
    else printf("%d在第%d个",n,mid+1);
}