打印繞圈矩陣（C語言風格的代碼）

// raoQuan.cpp : Defines the entry point for the console application.
//1 12  11  10
//2 13  16  9
//3 14  15  8
//4 5   6   7
#include "stdafx.h"
#include "iostream.h"
#include "malloc.h"

//根據x，y和size來返回這個位置的數值; x,y均從0開始計數
int orbit(int x,int y,int size);
int girth(int size);
int offsetOfBegin(int x,int y,int size);

int cycleXy(int x,int y,int size)
{
	int value=0;
	int level=orbit(x,y,size);
	int offset=offsetOfBegin(x,y,size);
	int i=-1;
	while(level>0)
	{
		level--;
		value += girth(size-level*2);		
	}
	value += offset;
	return value;
}

//根據size來返回周長
int girth(int size)
{
	if(size == 1)
	{
		return 1;
	}
	return (size-1)*4;
}

//根據x，y，size確定座標在第幾層軌道 
int orbit(int x,int y,int size)
{
	//int levels = size/2;
	//levels = size%2==0 ? levels : levels+1;
	int ox=size-1-x < x ? size-1-x : x;
	int oy=size-1-y < y ? size-1-y : y;
	return ox < oy ? ox : oy;
}

//座標x，y相對於該層軌道起始點的偏移
int offsetOfBegin(int x,int y,int size)
{
	int levels = size/2;
	levels = size%2==0 ? levels-1 : levels;

	int x0,y0;	//軌道起始點
	int offset=0;
	int level=orbit(x,y,size);

	x0=y0=level;
	int max=girth(size-level*2);
	offset=(x-x0)+(y-y0);
	if(x>y)
	{
		offset = max - offset;
	}
	return offset+1;
}

void raoQuan(unsigned int size)
{
	char *str;
	str = NULL;
	str = (char *)malloc(size*size*sizeof(char));
	int len=size*size;
	int i(0),index(0),nSize(size);
	for(;i<len;i++)
	{
		str[index]=i;
		index += nSize;
	}
}

int main(int argc, char* argv[])
{
	int size(7);
	//cin >> size;
	int x(0),y(0);
	for(y;y<size;y++)
	{
		for(x=0;x<size;x++)
		{			
			cout << cycleXy(x,y,size) << '\t';
		}
		cout << endl;
	}
	return 0;
}