A default constructor is the one that takes no argument. It is automatically invoked when an object is created without providing any initial values. In case, the programmer has not defined a default constructor, the compiler automatically generates it.
For example,
class A {...........};
A ob1; // uses default constructor for creating ob1.
A parameterized constructor with default argument is equivalent to a default constructor.
For example,
class A { int i;
float j;
public:
A(int a = 0,float b = 1000.0); //constructor with default argument };
A::A(int a,float b) //constructor definition
{ i = a; j = b;
}
int main()
{
A o1(23,27.50); // argument value passed for o
A o2; // takes default argument to o2(0,1000.0)
}
