编程范式学习代码--cmpfun

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void *lsearch(void *key, void *base, int n, int elemsize, int(*Cmpfun)(void *,void *))
{
    int i=0;
    for(i=0;i<n;i++)
    {
        void *elemAddr = (char*)base + i*elemsize;
        if(Cmpfun(key,elemAddr) == 0)
            return elemAddr;
    }
    return NULL;
}


int intCmp(void *elem1,void *elem2)
{
    int *ip1 = elem1;
    int *ip2 = elem2;
    return (*ip1 - *ip2);
}

int strCmp(void *vp1,void *vp2)
{
    char *s1 = *(char**)vp1;
    char *s2 = *(char**)vp2;
    return strcmp(s1,s2);
}

int main()
{
    //测试整形数组中查找相应整数
#if 0
    int arg[]={4,2,3,7,11,6};
    int size = 6;
    int number = 7;
    int *found = lsearch(&number,arg,6,sizeof(int),intCmp);
    if(NULL == found)
    {
        printf("no match
");
        getchar();
        exit(EXIT_SUCCESS);
    }
    else
    {
        printf("Found address 
%p : %d
",found,number);
        getchar();
        exit(EXIT_SUCCESS);
    }
#endif
    //测试字符串数组中查找相应字符串
#if 1
    char *notes[] = {"Ab","F#","B","Gb","D"};
    char *serchr = "Gb";
    char **found=lsearch(&serchr,notes,5,sizeof(char*),strCmp);
    if(NULL == found)
    {
        printf("no match
");
        getchar();
        exit(EXIT_SUCCESS);
    }
    else
    {
        printf("Found address 
%p : %s
",*found,serchr);
        getchar();
        exit(EXIT_SUCCESS);
    }

#endif
}