Написать программу вычисления сопротивления электрической цепи

#include <iostream>
#include <conio.h>
 
float function(float R1, float R2)
{
    return R1*R2/(R1+R2);
}
 
int main()
{
    setlocale(LC_ALL, "RUS");
    float R1 = 0, R2 = 0;
    std::cout << "Âû÷èñëåíèå ñîïðîòèâëåíèÿ ýëåêòðè÷åñêîé öåïè\n"
              << "ïðè ïàðàëëåëüíîì ñîåäèíåíèè ýëåìåíòîâ.\n\n"
              << "Âåëè÷èíà ïåðâîãî ñîïðîòèâëåíèÿ (Îì) ?> ";
    std::cin >> R1;
    std::cout << "Âåëè÷èíà âòîðîãî ñîïðîòèâëåíèÿ (Îì) ?> ";
    std::cin >> R2;
    std::cout << "Ñîïðîòèâëåíèå öåïè: " << function(R1, R2) << "Îì.";
    getch();
    return 0;
}

#include <iostream>
using namespace std;
 
#include <iomanip>
using std::setprecision;
 
double resistance(double, double);
 
void main()
{
    double R1,R2;
    cout<<"The Calculation of the resistance electric circuit under parallel join element"<<endl;
    
    cout<<"Enter R1:"<<endl;
    cin>>R1;
 
    cout<<"Enter R2:"<<endl;
    cin>>R2;
 
    cout<<"resistance electric circuit: "<<fixed<<setprecision(2)<<resistance(R1,R2)<<endl;
}
 
double resistance(double R1, double R2)
{
    double R=R1*R2/(R1+R2);
    return R;
}