我正在尝试使用 bsearch,但搜索结果一直保持为 NULL。我的名称数组按字母顺序排序。我是 C 的新手,需要你的帮助来了解我哪里错了。
这是一个数组
// arrays of children's names
char *chBamba[] = { "Bambale1", "Bamb2", "Bamb3", "Bambook4", "Bambookle5" };
char *chBisli[] = { "Bislile1", "Bischick2", "Bislile3", "Bis4" };
int nBamba = sizeof(chBamba) / sizeof(*chBamba);
int nBisli = sizeof(chBisli) / sizeof(*chBisli);
// array of workers
Worker a[] = { { "Printf", 10, NULL, 0 } ,{ "Bisli", 20, chBisli, nBisli },
{ "TapooChips", 3, chBamba, nBamba },{ "Bamba", 19, chBamba, nBamba } };
这是结构
typedef struct{
char name[LEN]; // worker's name
int salary; // worker's salary
char **childArr; // array of children names
int numChildren; // number of children}Worker;
比较功能
int compareNames(const void* child1, const void* child2){
char* ch1 = (char*)child1;
char* ch2 = (char*)child2;
return strcmp(ch1, ch2);
}
和搜索
char childName[10];
char* nameFound;
printf("Please enter a child name to search for :");
scanf("%s",childName);
for (i = 0; i < 4; i++)
{
nameFound =(char*) bsearch(childName,a[i].childArr, a[i].numChildren, sizeof(a[i].childArr)/ sizeof(a[i].childArr[0]), compareNames);
}
它是 C 而不是 C++。这就是我现在正在学习的内容。我正在使用 VS 2015,它适用于 C 和 C++。我正在编辑一些更改以使其正常工作并编译。所以比较是
int compareNames(const void * s1, const void * s2){
const char *key = (char*)s1;
const char * const *arg = (char**)s2;
return strcmp(key, *arg);
}
bsearch 是
nameFound = (char*)bsearch(childName,a[i].childArr, a[i].numChildren, sizeof(char*), compareNames);