Order of Constructor Invocation
Write a C++ Program to Show an Example demonstrating Order of constructor invocation. Here’s a Simple Program to illustrate Order of Constructor Invocation in C++ Programming Language.
What is Class and Objects in C++?
- The classes are the most important feature of C++ that leads to Object Oriented programming.
- Class is a user defined data type, which holds its own data members and member functions, which can be accessed and used by creating instance of that class.
- The variables inside class definition are called as data members and the functions are called member functions.
- Class is just a blue print, which declares and defines characteristics and behavior, namely data members and member functions respectively. And all objects of this class will share these characteristics and behavior.
- Objects are instances of class, which holds the data variables declared in class and the member functions work on these class objects.
- Each object has different data variables. Objects are initialized using special class functions called Constructors.
Below is the source code for C++ Program to illustrate Order of Constructor Invocation which is successfully compiled and run on Windows System to produce desired output as shown below :
SOURCE CODE : :
/* C++ Program to illustrate Order of Constructor Invocation */ #include<iostream> using namespace std; class SUBJECT { int days; int subjectno; public: SUBJECT(int d=123, int sn=101); void printsubject(void) { cout<<"\nSubject No: "<<subjectno<<"\n"; cout<<"\nDays: "<<days<<"\n"; } }; SUBJECT::SUBJECT(int d, int sn) { cout<<"\nConstructing SUBJECT......\n"; days=d; subjectno=sn; } class STUDENT { int rollno; float marks; public: STUDENT() { cout<<"\nConstructing STUDENT..........\n"; rollno=0; marks=0.0; } void getvalue(void) { cout<<"\nEnter roll number :: "; cin>>rollno; cout<<"\nEnter marks :: "; cin>>marks; } void print(void) { cout<<"\nRoll No: "<<rollno<<"\n"; cout<<"\nMarks: "<<marks<<"\n"; } }; class ADMISSION { SUBJECT sub; STUDENT stud; float fees; public: ADMISSION() { cout<<"\nConstructing ADMISSION........\n"; fees=0.0; } void print(void) { stud.print(); sub.printsubject(); cout<<"\nFees :: "<<fees<<"\n"; } }; int main() { ADMISSION adm; adm.print(); cout<<"\n\nBack to main()......\n"; return 0; }
OUTPUT : :
/* C++ Program to illustrate Order of Constructor Invocation */ Constructing SUBJECT...... Constructing STUDENT.......... Constructing ADMISSION........ Roll No: 0 Marks: 0 Subject No: 101 Days: 123 Fees :: 0 Back to main()...... Process returned 0
Above is the source code and output for C++ Program to illustrate Order of Constructor Invocation with Example which is successfully compiled and run on Windows System to produce desired output.
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