C语言：调整数组使奇数全部都位于偶数前面。

 % 2 == 0) && (i < len))
{
i++;
}
while ((arr[j] % 2 == 1) && (j < len))
{
j++;
}
if (i == len || j == len)
return;
if (i > j)
{
tmp = arr[i];
arr[i] = arr[j];
arr[j] = tmp;
tmp = i;
i = j;
j = tmp;
}
}
}

int main()
{
int arr[] = { 1, 2, 3, 4, 5 };
int len = sizeof(arr) / sizeof(arr[0]);

even_old_number(arr, len);
int i = 0;
for (i = 0; i < len; i++)
{
printf("%d ]另外，方法2也可以，
#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>

void even_odd(int *arr, int len)
{
int left = 0;
int right = len - 1;
while (left < right)
{
while((left < right) && (arr[left] % 2 == 1))
{
left++;
}
while((left < right) && (arr[right] % 2 != 1))
{
right--;
}
if (left < right)
{
int tmp = arr[left];
arr[left] = arr[right];
arr[right] = tmp;
left++;
right--;
}
}
}

int main()
{
int arr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
int i = 0;
int len = sizeof(arr) / sizeof(arr[0]);
even_odd(arr, len);
for (i = 0; i < len; i++)
{
printf("%d ", arr[i]);
}
printf("\n");
system("pause");
return 0;
}