bsearch示例

#include<iostream>#include<stdlib.h>using namespace std;int compare(const void*a,const void *b){return *((int*)a)-*((int*)b);}int main(){int ar[100],i;for(int i=0;i<100;i++)ar[i]=i+10;i=22;int *p;if(p=(int*)bsearch((void*)&i,(void*)ar,100,sizeof(int),compare))cout<<i<<' '<<*p<<endl;elsecout<<"error!"<<endl;cout<<"第"<<p-ar<<"个数"<<endl;return 0;}