2
我遇到了一些使用的指針/數組符號的問題。我有兩個列表並將它們排序,然後嘗試顯示它們。我在下面的代碼中有3條註釋,說明聲明是什麼以及爲什麼。我的代碼如下所示:C中使用qsort指針的幫助,bsearch
int Compare(const void *a, const void *b);
void SortStudents(char *studentList[], size_t studentCount)
{
qsort(studentList, studentCount, sizeof(studentList[0]), Compare);
}
int Compare(const void *a, const void *b)
{
return (strcmp(*(char **)a, *(char **)b));
}
/*Determines which registrants did not attend the first meeting by searching for registrants
that are not in attendees set. */
void DisplayClassStatus(
const char *registrants[], size_t registrantCount,
const char *attendees[], size_t attendeeCount)
{
char **missedFirstMeeting; // not sure if this is the right declaration
char *start, *end;
// not sure if this is right with the &attendees and registrants for the bsearch()
missedFirstMeeting = bsearch(&attendees, registrants, attendeeCount,
sizeof(attendees[0]), Compare);
printf("Missed First Meeting: \n");
//not sure if this the way to traverse through the array using pointers to display
for (start = missedFirstMeeting, end = &missedFirstMeeting[registrantCount-1]; start < end; ++start) {
printf("%s", *start);
}
}
如果這是作業,請添加'作業'標籤。 – 2010-02-20 23:17:47