#include <stdlib .h>
#include <stdio .h>
#include <iostream>
#define MAX 128
using namespace std;
 
int gotoxy(int x, int y)
{
	char essq[MAX]={0}; 
	sprintf(essq, "\033[%d;%df", y,x);
	printf("%s", essq);
	return 0;
}
 
void draw(int x1,int y1,int x2,int y2,char z) 
{
	int i;
	for (i=x1; i< =x2; i++) 
	{
		gotoxy(i,y1);
		cout<<z;
		gotoxy(i,y2);
		cout<<z;
	}
	for (i=y1+1; i<y2; i++)
	{
		gotoxy(x1,i);
		cout<<z;
		gotoxy(x2,i);
		cout<<z;
	}
}
 
void boom(int x1,int y1,int x2,int y2,char z) 
{
	int x,y,m=0,n=0;
 
	((x1+x2)%2) ? x=((x1+x2)/2)+1 : x=(x1+x2)/2 ;
	((y1+y2)%2) ? y=((y1+y2)/2)+1 : y=(y1+y2)/2 ;
 
	int i=x,j=y;
 
	do
	{
		system("clear");
		if(i<=x2)
		{
			m++;
			i++;
		}
		if(j<=y2)
		{
			n++;
			j++;
		}
		draw(x-m,y-n,x+m,y+n,z);
		getchar();		
	}while((i<=x2) || (j<=y2));
}
 
int main() 
{
	int x1=10, x2=40, y1=10,y2=40;
	char z='o';
	boom(x1,y1,x2,y2,z);
	cout<<endl;
 
}

float prostokat(float a, float b,bool &error)
{
	((a>0) && (b>0)) ? error=true : error=false;
	return a*b;
}

unsigned int silnia(unsigned n)
{
	long int i;
	int s=1;
 
	for (i=1;i< =n;i++)
        s=s*i;
	return s;
}
 
unsigned int silnia_r(unsigned n)
{
	int s;
	(n&lt;2) ? s=1 : s=n*silnia_r(n-1);
	return s;
}