create_points.cpp

#include <fstream>
#include <time.h>
#include <stdlib.h>

using namespace std;

int rand_number(int a, int b){return (rand()%(b-a+1)+a);}

int main(){
    srand(time(0));
    ofstream fout("in.txt");
    for(int i = 0, a = -5, b = 5, N = 10; i < N; i++)
        fout << rand_number(a, b) << " " << rand_number(a, b) << endl;
}