A constructor is a class function with the same name as the class itself. It cannot have a return type and may accept parameters. It is a callback or event for the compiler to call the constructor after memory allocation of the object is complete via new operator. Responsibility of constructor function is to set initial values to each object members to some default values before the object can be used.
Example: Here is an example of student class of standard 12. Constructor initializes the default name as blank and age of the student as 16.
age = 18;
int main(int argc, char* argv)
cout << "Age = " << s.get_age();//Default age = 16
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