顺时针绕圈输出二维数组（蛇形）

#include<iostream>
using namespace std;
#define N 10
int arr

;

int main(int argc, char *argv[])
{
int data = 1;
for (int  i = 0,j=0,k=0; k < (N+1)/2; k++)
{
while (j<N-k)
{
arr[i][j] = data;
j++;
data++;

}
j--;
i++;

while (i<N-k)
{
arr[i][j] = data;
i++;
data++;
}
i--;
j--;

while (j>k-1)
{
arr[i][j] = data;
j--;
data++;

}
j++;
i--;

while (i>k)
{
arr[i][j] = data;
i--;
data++;
}
i++;
j++;

}

for (size_t i = 0; i < N; i++)
{
for (size_t j = 0; j < N; j++)
{
cout << arr[i][j]<<"\t";

}
cout << endl;

}

system("pause");
return 0;
}