Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Does C++ compiler create default constructor when we write our own?
In this tutorial, we will be discussing a program to understand if the C++ compiler creates a default constructor when we write our own.
Generally, the C++ compiler uses the default constructor when no one is defined, but always uses the one defined by the user if any.
Example
#include<iostream>
using namespace std;
class myInteger{
private:
int value;
//other functions in class
};
int main(){
myInteger I1;
getchar();
return 0;
}Output
Compiles successfully
Example
#include<iostream>
using namespace std;
class myInteger{
private:
int value;
public:
myInteger(int v) //user-defined constructor
{ value = v; }
//other functions in class
};
int main(){
myInteger I1;
getchar();
return 0;
}Output
Gives error about user-defined constructor not being defined
Updated on: 23-Mar-2020
123 Views
Advertisements