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

double Celsius(double Farenheit);
int main()
{
    double F=0;
    double C;

    cout<<setw(15)<<left<<"Farenheit"<<setw(15)<<right<<"Celsius"<<endl;
    cout<<"____________________________________"<<endl;
    while (F<=20)
    {
        C = Celsius(F);
        cout<<setw(15)<<left<<F;
        cout<<setw(15)<<right<<C<<endl;
        F++;
    }
    return 0;
}
double Celsius(double Farenheit)
{
    double x = 5;
    int y = 32;
    int z = 9;
    return x*(Farenheit-y)/z;
}








#include <iostream>

using namespace std;

bool isPrime(int number);
int main()
{
int number;
    do
    {
        cout<<"Please enter any higher than 2 number and I will let you know if it is prime"<<endl;
        cin>>number;
        if (!cin)
        {
            cin.clear();
            cin.ignore(1000,'\n');
        }
    }while((!cin||number<2)&&(cerr<<"Please only enter positive whole numbers greater than 1!"<<endl));
    if (isPrime(number))
        cout<<number<<" is a prime number!"<<endl;
    else
        cout<<number<<" is not a prime number!"<<endl;
}
bool isPrime(int number)
{
    double r;
    int divisor = 2;
    while(divisor!=number)
    {
        r=number%divisor;
        if (r==0)
        {
            return false;
        }
        (divisor++);
    }
    return true;
}