本文实例为大家分享C++二分查找算法，通过改变边界位置来进行查找的方法，代码如下：

#include <iostream>using namespace std;int search(int *p,int length,int key);int search1(int *p,int length,int key);int main(){ cout << "Hello world!" << endl; int a[] = {1,2,3,4,5,6,7,8,8,8,9,10,11,12,13,14}; int len = sizeof(a)/sizeof(int); int pos = search1(a,len,8); cout << pos << endl; return 0;}int search1(int *p,int length,int key){ int left=0; int right=length-1; while(left<=right) { int mid = (left+right)/2; if(p[mid]>=key) { right = mid-1; }else { left = mid+1; } } if(left<length && p[left]==key) return left; return -1;}int search(int *p,int length,int key){ int left=0; int right = length -1; while(left<=right) { int mid = (left+right)/2; if(p[mid]==key) { return mid; } if(p[mid] > key) { right = mid+1; } if(p[mid]<key) { left=mid-1; } } return -1;}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。