#include <iostream>
#include <iomanip>
using namespace std;

bool targetHeartRate(int age, int beats)
{
    double minRate = (220 - age)*0.6;
    double maxRate = (220 - age)*0.7;

    if (beats >= minRate && beats <= maxRate)
        return true;
    else
        return false;

}

void main12()
{
    int age, beats;

    cout << "Enter your age: ";
    cin >> age;
    while (age < 0)
    {
        cout << "Enter a valid age: ";
        cin >> age;
    }

    cout << "Check and answer your beat per minute: ";
    cin >> beats;

    bool check = targetHeartRate(age, beats);

    if (check)
        cout << "You are in your target heartrate" << endl;
    else if (!check)
        cout << "Your are outside your target heartrate" << endl;

    system("pause");
}