c语言数据结构分析7之 二分查找

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct test{
    char* name;
    int age;
    int qq;
} date[]={
    {
        "solq",18,33333
    },
    {
        "wei cheng",20,444444  
    },
    {
        "hong",55,5555555
    }
};
int sreach(struct test* ar,char* name);
int main(int argc, char* argv[])
{
 
    int index=sreach(date,"solq");
    if(index<0) return 0;
    printf("name:%s\n",date[index].name);
    printf("age:%d\n",date[index].age);
    printf("qq:%d\n",date[index].qq);
    return 0;
}
int sreach(struct test* ar,char* name)
{
    int l,r,m,n=3;
    l=0;
    r=n-1;
     
    while(l<=r)
    {      
        m=(l+r)/2;
        if(strcmp(ar[m].name,name)==0)
            return m;
        else if (strcmp(ar[m].name,name)<0)     
            l=m+1;
        else       
            r=m-1;     
    }
    return -1;
}

  

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