Find compound interest using operator overloading - c++

Question

I am writing a code that tries to find out the simple and compound interest using operator overloading.
While I have found the simple interest, I am having problem with the compound interest.
#include<iostream>
#include<iomanip>
using namespace std;
class Interest
{
private:
double P;
double R;
double I;
public:
Interest(){};
~Interest(){};
void setP(double recieveP){P = recieveP;}
void setR(double recieveR){R = recieveR/100;}
double getP(){return P;}
double getI(){return I;}
Interest operator*(int T)
{
class Interest int1;
int1.I= P*R*T;
return int1;
}
};
int main()
{
class Interest simp1;
class Interest comp1;
double Principle,Rate,Years;
cout << "Enter the Principle Amount" << endl;
cin >> Principle;
simp1.setP(Principle);
comp1.setP(Principle);
cout << "Enter the Rate Amount" << endl;
cin >> Rate;
simp1.setR(Rate);
comp1.setR(Rate);
cout << "Enter the number of years:";
cin >> Years;
simp1 = simp1*Years;
cout << "The Simple Interest is: " << simp1.getI() << endl;
for(int i =0; i < Years; i++)
{
comp1 = comp1*1;
comp1.setP(comp1.getI()+comp1.getP());
}
cout << "The compound Interest is: " << comp1.getI() << endl;
return 0;
}
No matter what I enter the values for the compound Interest is always zero.

Answer 1

When you create object Interest int1 in operator *, you set only it's I value. P and R are uninitialized, so the have trash value, like 1.314e-304. You must copy values from the source:
Interest operator*(int T)
{
class Interest int1;
int1.P = P;
int1.R = R;
int1.I= P*R*T;
return int1;
}
You also should set default values for your class members in default constructor, to avoid future mistakes:
Interest() : P(0.0), R(0.0), I(0.0)
{
};