problem understanding a program

[2wv7M4Gy]

i just begun i C++ and i can not understand what is this program for :

#include <iostream>
#include <cstdlib>
#include <ctime>

using namespace std;

const int MaxRandomValue=20;

int main() {

int x1, y1;
int x2, y2;
int rx, ry;


int count=0;







cout<<"max random value is "<<MaxRandomValue<<endl<<endl;
//input
do{
cout<<"x1: "; cin>>x1;
}
while (x1<0);
do{
cout<<"y1: "; cin>>y1;
}
while (y1<0);
do{
cout<<"x2: "; cin>>x2;
}
while (x2<x1);
do{
cout<<"y2: "; cin>>y2;
}
while (y2<y1);

//random loop
do {

rx = rand() % MaxRandomValue;
ry = rand() % MaxRandomValue;
count ++;
cout<<"x= "<<rx<<endl<<"y= "<<ry<<endl<<endl;
}
while (!((rx>=x1)&&(rx<=x2)&&(ry>=y1)&&(ry<=y2))); //(!( ( ((rx>=x1)&&(rx<=x2)) || ((rx<=x1)&&(rx>=x2)) ) && ( ((ry>=y1)&&(ry<=y2)) || ((ry<=y1)&&(ry>=y2)) ) ));

cout<<"took me "<<count<<" tries."<<endl;




system("pause");
return 0;
}


If anyone could help me i would appreciate it !

[Bazzy]

It ask for x1 and y1 to be greater than 0, x2 and y2 to be greater respectively to x1 and y1.
Than it try to find rx and ry to be in between of x1, x2 and y1, y2 assigning them random values, eg:

input:
x1 = 2
x2 = 7
y1 = 3
y2 = 6

output:
rx = 5
ry = 4

[anders43]

the (x1,y1), (x2,y2) outline a rectangle area, the (rx,ry) is a coordinate 'guess' when the guess comes inside the area, the loop ends.