What's wrong?

Question

C++ / C#

Does not display volumeC although everything seems to be correct
AND the PChar function.

using namespace std;

#include <iostream>
#include <math.h>
struct TCone
{
    float high;
    float rad;

};

class CTCone
{
    private:
        TCone Cone;
    public:
        void init(float high, float rad);
        void input();
        void output();
        char* toPChar();
        float getHigh() { return Cone.high; }
        float getRad() { return Cone.rad;  }
        void setHigh(float high) { Cone.high = high; }
        void setRad(float rad) { Cone.rad = rad; }
};
//input
void CTCone::input()
{
    cout << "Enter high of Cone:";
    cin >> Cone.high ;
    cout << "Enter radius of Cone:";
    cin >> Cone.rad;
}
//init
void CTCone::init(float high, float rad)
{
    Cone.high = high;
    Cone.rad = rad;
}
//Output
void CTCone::output()
{
    cout << "High of Cone = " << Cone.high << endl;
    cout << "Radius of Cone = " << Cone.rad << endl;
}
//Char
char* CTCone::toPChar()
{
    char* str = new char[100];
    //sprintf(str, "%.f %.f ", Cone.high, Cone.rad); /////////////////////////////////////////
    return str;
}
// PLOSHA
float areaC(CTCone Cone)
{
    float area;
    const float pi = 3.14159265359;
    area = (pi*Cone.getRad());
    return area;
}
//OB`EM
float volumeC(CTCone Cone)
{
    float volume;
    const float pi = 3.14159265359;
    volume = (1/3*pi*Cone.getRad()*Cone.getRad()*Cone.getHigh());
    return volume;
}
//ANGLE
/*float angleC(CTCone cone)
{
    float angle;

}*/
//PORIVNYANYA
bool compare(CTCone cone1,CTCone cone2)
{
    const float pi = 3.14159265359;
    if ((1/3 * pi * cone1.getRad()* cone1.getHigh())==(1/3 * pi * cone2.getRad()* cone2.getHigh()))
        return true;
    else
        return false;
}


int main()
{
    CTCone cone1,cone2;
    int init;
    cout << "1: input() or 2: init():";
    cin >> init;
    if (init == 1){
        cone1.input();
        cone2.input();
    }
    else if (init == 2){
        cone1.init(6,4);
        cone2.init(8,2);
    }
    cone1.output();
    cone2.output();
    cout << "Area of cone1 = " << areaC(cone1)<< endl;
    cout << "Volume of cone1 = " << volumeC(cone2)<< endl;
    if ((compare(cone1,cone2))== true )
        cout << "Volume of cones is the same";
    else
        cout << "Volume of cones is different";
    cout << "First cone : " << cone1.toPChar() << endl;
    cout << "Second cone : " << cone2.toPChar() << endl;
    
}

Answer 1

1/3 = 0