Variables

 

C++ Variable

A variable is a name of memory location. It is used to store data. Its value can be changed and it can be reused many times.

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Rules for defining variables

• A variable can have alphabets, digits and underscore.
• A variable name can start with alphabet and underscore only. It can't start with digit.
• No white space is allowed within variable name.
• A variable name must not be any reserved word or keyword e.g. char, float etc.
• Length upto 35 char

    First Program

#include<iostream>

using namespace std;

main()

{

cout<<"Hello World";

return 0;

}

                    Output:

                Hello World