#include 
     
      char arraysearch(int data){//some code    return (data+2);}char linkedlistsearch(int data){//some code    return (data-2);}char binarysearch(int data){//some code    return (data * 2);}//funcptr为函数指针，函数有一个int参数，返回charchar search( char (*funcptr)( int ), int data ){    return (*funcptr)(data);}int main(int argc, char* argv[]){    printf("Input Options\n");    printf("1 arrsrch\n");    printf("2 linkedlistsrch\n");    printf("3 binarysrch\n");    printf("4 exit\n");    int choice = 0;    int data;    int ret = 0;        while(choice != 4)    {        printf("Input choice:\n");        scanf("%d", &choice);        if(choice == 4)        {            printf("goodbye!\n");            break;        }                           printf("Data to search\n");        scanf("%d", &data);        if(choice == 1)        {            ret = search(arraysearch, data); //invoking 1st function        }        else if(choice == 2)        {            ret = search(linkedlistsearch, data); //invoking 2nd function        }        else if(choice == 3)        {            ret = search(binarysearch, data); //invoking 3rd function        }                        printf("ret = %d\n", ret);    }    return 0;}