#include <stdlib.h> void qsort(void *base, size_t numelem, size_t size, int (*cmp)(const void *e1, const void *e2));
This function sorts the given array in place. base is the address
of the first of numelem array entries, each of size size
bytes. qsort
uses the supplied function cmp to determine
the sort order for any two elements by passing the address of the two
elements and using the function's return address.
The return address of the function indicates the sort order:
None.
ANSI, POSIX
typedef struct { int size; int sequence; } Item; int qsort_helper_by_size(const void *e1, const void *e2) { return ((const Item *)e2)->size - ((const Item *)e1)->size; } Item list[100]; qsort(list, 100, sizeof(Item), qsort_helper_by_size); int qsort_stringlist(const void *e1, const void *e2) { return strcmp(*(char **)e1, *(char **)e2); } char *slist[10]; /* alphabetical order */ qsort(slist, 10, sizeof(char *), qsort_stringlist);
Go to the first, previous, next, last section, table of contents.