You can do it in another way, but using c++
#include<iostream>
#include<math.h>
namespace std;
int main(){
double r1, r2,r3,parallel_resistance;
cout<<"Enter R1";
cin>>r1;
cout<<"Enter R2";
cin>>r2;
cout<<"Enter R3";
cin>>r3;
parallel_resistance = 1 / (1 / R1 + 1 / R2 + 1 / R3);
cout<<"Your...