Learn C++ Language with Free Lessons & Tips

# include

using namespace std;

int main()

{

cout<<"Welcome to C++";

return 0;

}

1. Use IDE such as CodeBlocks to run this program. To do this, open CodeBlocks, Goto File->New->Empty File.
2. Copy the above code and go to File->Save the file. Give a name and extension .cpp.
3. About the program: Program execution ALWAYS starts from the main; this is a function. We will discuss more functions in later discussions; for now, consider it as a machine. You give some input; you get some output. Cout << is used to print any output messages or display any information. Remember to enclose messages in double-quotes.
4. Dont forget to end lines with semicolons.
5. Return 0 returns an integer value 0 for function main.In easy terms, it tells that everything worked fine.
6. Functions always have opening and closing brackets.
7. # include is a preprocessor directive telling the compiler to add header file iostream before including the rest of the program.IOSTREAM is an Input-Output stream. It allows you to use various objects related to I/O.
8. Using name std. C++ has a standard library that contains common functionality you use in building your applications. The using namespace means that in the scope it is present, make all the things under the std namespace available without having to prefix std:: before each of them.

Yes, "C" is a sea, with C, you write high-level programs, assembly level using #Pragma & handle peripheral devices directly, With curses & 'C' you can play with "C and implement a graphical user interface for Linux", and the more  :) you play with ASCII and Colour background in MS-DOS environment. Even much more 'C' language can do. I know this much.

Using recursion;

#include<iostream>

void printNTimes(int nTimes)
{
if(nTimes <= 0)
return;
std::cout<<"I love programming ";
printNTimes(--nTimes);
}

int main()
{
int n = 0;
std::cin>>n;
printNTimes(n);
}

These rules are instrumental when you design your class.

When you create/write a new class, you always think of 5 place holder methods in it.

Earlier it was three, but after C++ 11 it became 5.

They are: 

1. Constructor 
2. Copy Constructor
3. Assignment operator; After C++11 - 
4. Move Copy constructor 
5. Move Assignment operator.

• Rule of 0 means, your class is designed in a way, such that you don't need any of 1,2,3,4,5
• Rule of 3 means, you need 1,2,3
• Rule 3 of 5 means, you need all 1,2,3,4,5

Best case is to design a class so that you have a rule of 0. But it's not always possible.

It will depend on the nature of your class members. It's bad practice to have them as raw pointers because then you have to write these constructors carefully and also think about resource leakage. Sometimes, we make them shared pointer or unique pointer etc. to reduce our work of writing these constructors and methods. If your class members are themselves following the rule of 0,3,5 etc., then it will also affect your decision whether you have to give all 5 or 0 or 3.

In a nutshell, it's always a good practice to think about these five methods, whenever you write a new class. 

Good question!!