C++ FUNDAMENTALS (IDENTIFIER, VARIABLE )

FUNDAMENTALS C++

1. C++ Data Types

2. Bjarne Stroustrup

3. Data types A  data type  is a classification that dictates what a variable or object can hold

4. 3 Basic Major Data Types Numerical Alphabetic Logical

5. Numerical Two broad categories Integer numbers Whole number 3 types : int , short and long) Floating point numbers 2 types: float and double Can be represented by Decimal: 3.1478 Scientific notation: 2.75e3 same as 2.75 x 10 3

6. Alphabetic Data Type Character Data type Store a single character Represented in single quote: ‘x’ , ‘A’ Strings Data type Store 2 more characters : “Melissa” or “apple” Keyword is string

7. Logical Data Supports two vaues : true or false Keyword: bool

8. C++ Primitive Data Types Primitive types integral floating char short int long bool float double long double unsigned

9. What is an Identifier? An identifier is the name to denote labels, types, variables, constants or functions, in a C++ program. C++ is a case-sensitive language. Age is not age Identifiers should be descriptive Using meaningful identifiers is a good programming practice

10. Rules in Naming Identifier You can use upper and lowercase letters, digits from 0 to 9, and underscore(_). The first character must be letter or underscore ( _ ). Don’t contains any blank,<,>,&,!,%,^,*,…etc. C++ is case sensitive –uppercase and lowercase letters are different, so a1 and A1 are different identifier. Not a keyword( int , float, double char, void, return main) Don’t give the same name to two different variables .

11. The C++ Key Words

12. Variable Location on computer’s memory to store data then use and change its value in a program

13. [data type] [variable name] = initial value; Variable declaration

14. Variable Declaration

15. Constant Fixed values keyword: const Declaration: const [data type] [name] = initial value example const float pi = 3.14159;

16. Arithmetic Operators

17. Special Characters

18. Common Escape Sequences

19. Sample Program Write a program in C++ to print the sum of two numbers Sample output

20. Write a program in C++ to add two numbers accept throughkeyboard .

21. Using getline