C語言 qsort() 函數

/**函數原型：#include <stdlib.h>void qsort( void *buf, size_t num, size_t size, int (*compare)(const void *, const void *) );**/// For example:int compare( const void* a, const void* b ){   int* arg1 = (int*)a;   int* arg2 = (int*)b;   if ( *arg1 < *arg2 ) return -1;   else if ( *arg1 == *arg2 ) return 0;   else return 1;               //此為降序排列}int cmp( const void* a, const void* b ){    return *(int*)a - *(int*)b;     //簡潔的寫法，為升序排列}// qsort()還可以對字串排序，如下int cmp( const void* a, const void* b ){    return strcmp((char*)a, (char*)b);}