C语言习题3

在一个有序数组中查找具体的某个数字n。 编写int binsearch(int x, int v[], int n); 功能:在v[0]
<=v[1]<=v[2]<= ....<=v[n-1]的数组中查找x.

择半查找算法/二分查找算法：

#include <stdio.h>

int main()
{
  int number[10] = {1,2,3,4,5,6,7,8,9,10};      
  int sz = sizeof(number)/sizeof(number[0]);
  int left = 0;
  int right = sz-1;
  int x = 7;
  int mid;
  for(;left<=right;)
  {
    mid = (left+right)/2;
    if(number[mid]<x)
    {
      left = mid + 1;
    }
    else if(number[mid]>x)
    {
      right = mid - 1;
    }   
    else 
    {
      printf("找到了，下标是%d\n",mid);
      break;
    }
  }
  if(number[mid] != x)
    printf("没有找到\n");
  return 0;
}