调整数组使奇数(odd)全部都位于偶数(even)前面

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>
void first_odd(int *str, int sz)
{
	int i = 0;
	int j = 0;
	int k = 0;
	int odd_count = 0;
	int even_count = 0;
	int* odd = malloc(sz*sizeof(int));
	if (odd == NULL)
	{
		perror("error");
	}
	odd=memset(odd, 0, sz*sizeof(int));
	int* even = malloc(sz*sizeof(int));
	if (even == NULL)
	{
		perror("error");
	}
	even=memset(even, 0, sz*sizeof(int));
	for (i = 0; i < sz; i++)
	{
		if ((str[i] & 1) == 1)
		{
			odd[j++] = str[i];
			odd_count++;
		}
		else
		{
			even[k++] = str[i];
			even_count++;
		}
	}
	for (i = 0; i < odd_count; i++)
	{
		str[i] = odd[i];
	}
	for (j = 0; i <sz ; j++)
	{
		str[i++] = even[j];
	}
}
void show(int *str, int sz)
{
	if (sz > 0)
	{
		show(str, sz - 1);
		printf("%d ", *(str + sz-1));
	}
	else
	{
		str = 0;
	}
}
int main()
{
	/*int arr[] = { 1,2,3,4,5,6,7};*/
	int* arr[10] = { 0 };
	int i;
	srand((unsigned)time(NULL));//初始化随机数
	for (i = 0; i < 10; i++)
	{
		arr[i] = rand() % 100;
	}
	int sz = sizeof(arr) / sizeof(arr[0]);
	first_odd(arr, sz);
	show(arr, sz);
	system("pause");
	return 0;
}