Constructor in C++: Constructor will be the same as class name in CPP programming language. In previous page, we have discussed about “Constructors & destructors” in detail. If you need more clarification, just go through that page for the clear understanding of constructors in C++.

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This page also has 2 more example source code of the same era. But here you can find different programming concepts. They are,

• Constructor with Default arguments,
• Power values calculation using constructors.
• Read: Call by Reference programs with example code

In this section we never used any single piece of code about destructors. This is fully for constructors and its operations. Example code is given below for the better understanding.

• Related: Operator Overloading: C++ program for SET operations

Constructor with Default Arguments:

#include<iostream.h>
#include<conio.h>
// Class definition of Cube
class C1
{
int a, b, c;
public:
C1(int a1=0, int b1=0, int e1=0) // Default parameter constructor
{
a=a1;
b=b1;
c=e1;
}
int Vlm() // Calculation of Volume
{
return a*b*c;
}
};
int main()
{
clrscr();
C1 x(1,2,5),y;
cout<<x.Vlm()<<"\n";
cout<<y.Vlm();
getch();
return 0;
}

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Power values calculation using constructors:

#include<iostream.h>
#include<conio.h>
// Class POWER value calculation
class Pow1
{
double m;
int t;
double V1;
public:
Pow1(double B, int E); //Constructor with TWO Parameters
double inputp() //Function
{
return V1;
}
};
Pow1::Pow1(double B, int E)
{
m=B;
t=E;
V1=1;
if(E==0) return;
for( ;E>0;E--)
V1=V1*m;
}
// Main Function
int main()
{
clrscr();
Pow1 p(5.0, 1), j(3.2, 2), v(5.3, 3);
cout<<p.inputp()<<" ";
cout<<j.inputp()<<" ";
cout<<v.inputp()<<"\n";
getch();
return 0;
}