C++ Basics

Variables and Data Types

In C++ you must declare the type of every variable.

int age = 21;
double price = 99.5;
char grade = 'A';
bool passed = true;
string name = "Ali";       // needs #include <string>
const double PI = 3.14159; // can't change

Type	Stores	Example
`int`	Whole numbers	`42`
`long long`	Very large whole numbers	`9000000000`
`double`	Decimals	`3.14`
`char`	One character, single quotes	`'A'`
`bool`	`true` / `false`	`true`
`string`	Text, double quotes	`"Hello"`