Variables in C++

The official C++ logo. Source: https://dwglogo.com/cplusplus/

Variables in C++ are to be written in a bracket next to the data type intended for the variable. The main data types are given here. For example;

#include <iostream> 
using namespace std; 
int main() { cout<<"C++ Variables.\n"; char x; cout<<"Enter any character:"; cin>>x; cout<<"Your character is:"<<x; }

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This adding of the data type before the variable is called declaring the variable. Every variable has to be declared before it can be executed.

Rules for declaring variables in C++

1. The variable can contain letters, digits and underscores.
2. The variable needs to begin with a letter of the alphabet or an underscore.
3. The name of the variable can not contain whitespace or special characters.
4. Any C++ keyword (for eg. float, int, char, etc.) cannot be used as a variable.
5. The name of the variable is case sensitive. For example, ‘coding’ is different from ‘Coding’.

You can declare multiple variables by adding a comma between the variables after the data type.

The concept of variables is quite simple in C++ and does not require much thought. If you remember how to declare a variable and remember the rules, you are good.

Constants

When you don’t want anyone changing the value of a variable, you can change it into a constant. Constant has a keyword ‘const’ which needs to be added before the data type of the variable. For example;

#include <iostream> 
using namespace std; 
int main() 
{
cout << "Constants in C++.\n"; 
const int x=20; 
cout << x; 
}

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That is all for this post. Follow this blog to get more info on coding and coding languages.

Regards,

Aarav Iyer

References:
(1)https://www.geeksforgeeks.org/cpp-variables/
(2) https://www.w3schools.com/cpp/cpp_variables.asp

Originally published at https://pycodingguide.blogspot.com