#ifndef CIRCUIT_H
#define CIRCUIT_H
#include <iostream>
using namespace std;

class Resistor
{
    public:
    void setResistance(double);
    double getResistance();
    double GenerateRandomCircuit();
    double calctotalResistance();
    void GenerateQuiz();
    int op[7],res[8];

    private:
    double r;
};
#endif // CIRCUIT_H

#include "Circuit.h"
#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <ctime>
using namespace std;

void Resistor::setResistance(double r1)
{
    r=r1;
}

double Resistor::getResistance()
{
    return r;
}
double Resistor::GenerateRandomCircuit()
{
    int j=0,k=0,x;
    double y,z;
    srand(time(NULL));
    int random=rand()%6+3;
    for(int i=1;i<=random;i++)
    {
        x=1+rand()%9;
        y=(1+rand()%9)*0.1;
        z=x+y;
        int sign=rand()%2+1;
        if(sign==1)
        {
            op[x]='+';
            cout<<"+";
        }else if(sign==2)
        {
            op[x]='/';
            cout<<"/";
        }
        cout<<fixed<<setprecision(1)<<z;
    }
    return z;
}

double Resistor::calctotalResistance()
{
    int x=0,y=0;
    double tempres[99]={};
    double temptotal,total;
    for(int i=0;i<4;i++)
    {
        if(op[x]=='/')  //If operator of symbol "/", it will convert temporary resistor to 1/(value of resistor)
        {
            temptotal =((tempres[i]*tempres[i+1])/(tempres[i]+tempres[i+1]));
            i++;
        }else if(op[x]=='+')
        {
            total=tempres[x]+tempres[x+1];
        }else if(i==3)
        {
            total=tempres[x]+tempres[x+1];
        }
    }
    return total;
}

void Resistor::GenerateQuiz()
{
    Resistor a;
    int mark=0;
    double answer,resistance;
    string formula;
    for(int i=1;i<=5;i++)
    {
        cout<<"Circuit "<<i<<" formula is "; a.GenerateRandomCircuit(); cout<<endl;
        cout<<"Enter circuit "<<i<<" total resistance:";
        cin>>answer;
        resistance=calctotalResistance();
        if(resistance==answer)
        {
            mark++;
        }
    }
    cout<<endl;
    cout<<"Your mark for this quiz is "<<mark<<"/5"<<endl;
}

#include <iostream>
#include <iomanip>
#include <string>
#include <cstdlib>
#include "Circuit.h"
using namespace std;

int main()
{
int choice,quiz;
string formula;
double formula1,totalres;
Resistor b;
cout <<"*** Welcome to Total Resistance Calculator Program ***"<<endl;
cout<<"1. Enter circuit formula."<<endl;
cout<<"2. Generate circuit randomly."<<endl;
cout<<"3. Show circuit formula."<<endl;
cout<<"4. Calculate total resistance."<<endl;
cout<<"5. Play a quiz."<<endl;
while(choice!=-1)
{
    cout<<"Your choice [1-5] : ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            cout<<"Enter circuit formula: ";
            cin>>formula;
            break;
        case 2:
            cout<<"Random circuit is generated."<<endl;
            break;
        case 3:
            cout<<"Circuit formula is ";
            b.GenerateRandomCircuit();
            cout<<endl;
            break;
        case 4:
            cout<<"Circuit total resistance is "<<setprecision(1)<<b.calctotalResistance()<<" ohm"<<endl;
            break;
        case 5:
            cout<<"Quiz is selected."<<endl;
            b.GenerateQuiz();
            break;
    }
}
return 0;
}

I had write the coding to calculate total resistance of circuit by using series and parallel formula, but it keeps prompt out total resistance is 0 ohm. Can anyone help me to solve it?

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