#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <string.h>#define oops(msg) {perror(msg); exit(errno);}#define NUM 7/*#include <stdlib.h>void *bsearch(const void *key, const void *base, size_t nmemb, size_t size, int (*compar)(const void *, const void *));void qsort(const void *base, size_t nmemb, size_t size, int (*compar)(const void *, const void *)); */int cmp_int(const int *a, const int *b){return *a - *b;}int main(void) {int i;int array_int[NUM] = {4, 56, 32, 2, 67, 43, 51};qsort(array_int, NUM, sizeof(int), cmp_int);for(i = 0; i < NUM; i++)printf("%d ", array_int[i]);putchar('\n');int key = 62; //why no response in case of "int *key?"int *value = (int*) bsearch(&key, array_int, NUM, sizeof(int),cmp_int);if(value == NULL)printf("The key is not found\n");elseprintf("value is : %d", *value);//===============================char array_str[NUM][NUM*10] = {"Shanghai", "Changsha", "Shenzhen", "Guangzhou","Nanjing", "Xian", "Hangzhou" };char *array_str2[NUM] = {"Shanghai2", "Changsha", "Shenzhen", "Guangzhou","Nanjing", "Xian", "Hangzhou" }; //no responseqsort(array_str, NUM, NUM*10, strcmp);for(i = 0; i < NUM; i++)printf("%s ", array_str[i]);putchar('\n');char *str_key = "Shanghai";char *str_find = (char*) bsearch(str_key, array_str, NUM, NUM*10, strcmp);if(str_find == NULL)printf("The str_key is not found\n");elseprintf("str_key is : %s", str_find);return EXIT_SUCCESS;}
