렌덤워크/조재화

~cpp 
#include <iostream>
#include<cstdlib>				// For rand() and srand()
#include<ctime>					//For time(0)
using namespace std;

int count[40][20];				//maximum size of the count array is 40*20

//move dirction
int imove[8] = {-1,0,1,1,1,0,-1,-1};
int jmove[8] = {1,1,1,0,-1,-1,-1,0};

//variable
int counter = 0;
int ibug, jbug;		//start point(x,y)
int n,m;			//array's range is n*m
//funtion
void input();		
void init();
void move();
bool is_end();
void output();

int main()
{
	init();				//inital count array
	input();			//input the board size
	move();				//cackroach move the board
	output();			//print result about count_array and Total_count_Number
	return 0;
}

void init()				//inital count array
{
	for(int i=0; i<n; i++)
	{
		for (int j=0; j<m;j++)
			count[i][j] = 0;
	}
}

void input()
{
	cout<<"input size of the board : ";			//input m and n  (for make M*N array)
	while(cin>>n>>m)
	{
		//size range : 2<n<=40 and 2<m<=20
		if( ( n<=2 || n>40 ) || ( m<=2 || m>40 )  )
		{
			cout<<"the board's size is out of range. try again :";
			continue;
		}
		break;
	}
	
	cout<<"input start point : ";
	while(cin>>ibug>>jbug)
	{
		//point range : 2<n<=40 and 2<m<=20
		if( ( ibug<=0 || ibug>40 ) || ( jbug<=0 || jbug>40 )  )
		{
			cout<<"start point is out of range. try again:";
			continue;
		}
		break;
	}
}

void move()
{
	count[ibug][jbug]++;		//inital the start point
	srand(time(0));				//for make random number
	int k;						//random variable
	while( is_end() )
	{
		k = rand()%8;			// random value range :0~7 
		
		//the board's range 
		if( (ibug+imove[k]) >=0 && (ibug+imove[k]) < n
			&& (jbug+jmove[k])>=0 && (jbug+jmove[k]) < m )
		{
			//벌레의 이동한 좌표
			ibug += imove[k];
			jbug += jmove[k];

			count[ibug][jbug]++;//check the visiting room.
			counter++;		
		}
		else
			continue;//범위밖으로 나가면 다시 랜덤값 결정.
	}

}

bool is_end()					//각방을 다 방문했는지를 검사
{
	if(counter >= 50000)		//excute limitation
		return false;

	for (int i =0; i<n ; i++)
	{
		for(int j=0; j<m; j++)
		{
			if(count[i][j] == 0)
				return true;
		}
	}
	return false;
	
}
void output()
{
	cout<<"Total moving Number : "<<counter<<endl;
	for(int i =0; i<n; i++)
	{
		for(int j=0; j<m; j++)
		{
			cout.width(3);
			cout<<count[i][j]<<" ";
		}
		cout<<endl;
	}
}