《剑指offer》:[20]顺时针打印数组

#include <iostream>
using namespace std;
int arr[5][5]={1,2,3,4,5,
<span style="white-space:pre">	</span>16,17,18,19,6,
15,24,25,20,7,
14,23,22,21,8,
13,12,11,10,9};
void PrintMatrixInCircle(int (*array)[5],int columns,int rows,int start);
void PrintMatrixClockWisely(int (*array)[5],int columns,int rows);
void PrintMatrixClockWisely(int array[][5],int columns,int rows)
{
if(NULL==array || columns<=0 || rows<=0)
return;
int start=0;
while(columns > 2*start && rows>2*start)
{
PrintMatrixInCircle(array,columns,rows,start);
++start;
}
}
void PrintMatrixInCircle(int array[][5],int columns,int rows,int start)
{
int EndX=columns-1-start;
int EndY=rows-1-start;
for(int i=start;i<=EndX;i++)//打印第一行；
cout<<array[start][i]<<" ";
if(start<EndY)
{
for(int i=start+1;i<=EndY;i++)//打印列；
cout<<array[i][EndX]<<" ";
}
if(start<EndX && start<EndY)
{
for(int i=EndX-1;i>=start;i--)  //打印行；
cout<<array[EndY][i]<<" ";
}
if(start<EndX && start<EndY-1)
{
for(int i=EndY-1;i>=start+1;i--)
cout<<array[i][start]<<" ";
}
}
int main()
{
PrintMatrixClockWisely(arr,5,5);
cout<<endl;
system("pause");
return 0;
}