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[DeathHourbg]

There are set K circles (the abscissa and the horde of the center and radius) and m (m<=20) points (abscissa and ordin) are set. write a program to determine how many circles each point lies in.

But I have errors and I don't know how to solve them.
<
#include<iostream>
#include<stdlib.h>
#include<conio.h>
using namespace std;

int main() {
system("chcp 1251");
int k; //Circle numbers
int m; //Point numbers
float x[20], y[20],
X[20], Y[20],
R[10];
cout << "Number of points:"; cin >> k;
for (int i = 0; i < k; i++)
{
cout << i << "-Circle: \n";
cout << "X:"; cin >> X[i];
cout << "Y:"; cin >> Y[i];
cout << "R:"; cin >> R[i];
}
//Въвеждане на данните а точките
for (int j = 0; j < 20; j++) {
cout << j << "-point:\n";
cout << "x:"; cin >> x[j];
cout << "y:"; cin >> y[j];
}
int Br[20]; //Number of circles
for (int j = 0; j < m; j++)
{
Br[i] = 0;
for (int i = 0; i < k; i++)
if (pow(x[j] - X[i], 2) + pow(y[j] - Y[i], 2) <= pow(R[i], 2)) Br[i]++;
}
//Result - Number of Circles
for (int i = 0; i < m; i++) cout << Br[i] << endl;
getch();
}
>

[Ganado]

Next time, post the errors you get. Don't make us find them.

 In function 'int main()':
33:8: error: 'i' was not declared in this scope
35:27: error: 'pow' was not declared in this scope

pow is found within #include <cmath>.
i does not exist on the line you're trying to access it on.

    int Br[20]; //Number of circles
    for (int j = 0; j < m; j++)
    {
        Br[i] = 0;
        for (int i = 0; i < k; i++)
            if (pow(x[j] - X[i], 2) + pow(y[j] - Y[i], 2) <= pow(R[i], 2))
                Br[i]++;
    }

Perhaps you meant j, for both lines where you access Br[i]? Otherwise, you are also potentially incrementing Br[i] before initializing it.

[seeplus]

Reformatted gives:

#include <iostream>
#include <cstdlib>
//#include <conio.h>
using namespace std;

int main() {
	//system("chcp 1251");
	int k; //Circle numbers
	int m; //Point numbers
	float x[20], y[20], X[20], Y[20], R[10];

	cout << "Number of points:";
	cin >> k;

	for (int i = 0; i < k; i++) {
		cout << i << "-Circle: \n";
		cout << "X:";
		cin >> X[i];

		cout << "Y:";
		cin >> Y[i];

		cout << "R:";
		cin >> R[i];
	}

	for (int j = 0; j < 20; j++) {
		cout << j << "-point:\n";
		cout << "x:";
		cin >> x[j];

		cout << "y:";
		cin >> y[j];
	}

	int Br[20]; //Number of circles

	for (int j = 0; j < m; j++) {
		Br[i] = 0;

		for (int i = 0; i < k; i++)
			if (pow(x[j] - X[i], 2) + pow(y[j] - Y[i], 2) <= pow(R[i], 2))
				Br[i]++;
	}

	//Result - Number of Circles
	for (int i = 0; i < m; i++)
		cout << Br[i] << endl;

	//getch();
}

L38, L47 - m is used but it's value is not set anywhere??

L39 - i is used but is not initialised - is j meant (also L43)?

[keskiverto]

Didn't we already suggest you to post code with code tags? See https://www.cplusplus.com/articles/jEywvCM9/

You "have errors". There "is solution". You have to describe those errors in detail if you want more detailed answer.

[DeathHourbg]

I make new code but i make at how many points each circle lies, but i don't know how to make code for in how many circles lies each point.

#include<iostream>
#include<stdlib.h>
#include <conio.h>
using namespace std;
int main() {
	system("chcp 1251");
	int k,//-Number of circles
		m;//- Number of points
	float x[20], y[20],
		X[10], Y[10],
		R[10]; 
		//Enter circles data
	cout << "Number of circles:"; cin >> k;
	for (int i = 0; i < k; i++) {
		cout << i << "-of Circle: \n";
		cout << "-the abc of the center:"; cin >> X[i];
		cout << "-the horde of the center:"; cin >> Y[i];
		cout << "-the radius of the circumference:"; cin >> R[i];
	}
	//Entering points data
	cout << "Number of points:"; cin >> m;
	for (int j = 0; j < m; j++) {
		cout << j << "-Point:\n";
		cout << "-the abscissa of the point:"; cin >> x[j];
		cout << "-the horde of the point:"; cin >> y[j];
	}
	int br[10];
	for (int i = 0; i < m; i++) {
		br[i] = 0;
		for (int j = 0; j < m; j++)
			if (pow(x[j] - X[i], 2) + pow(y[j] - Y[i], 2) <= pow(R[i], 2)) br[i]++;
	}
	//Results
	for (int i = 0; i < m; i++) cout << br[i] << endl;
	//getch();
}

[JLBorges]

for( int i = 0 ; i < num_points ; ++i ) // for each point (outer loop)
{
    int cnt = 0 ; // count of how many circles this point lies in
    
    for( int j = 0 ; j < num_circles ; ++j ) // for each circle (inner loop)
    {
        // increment cnt if point #i lies in circle #j
        if( point_#i_lies_in_circle_#j ) ++cnt ; // pseudocode
    }
    
    print x, y, cnt // pseudocode
}