c++ programming Unit 2 basic structure of a c++ program

BASIC STRUCTURE OF A C++ PROGRAM
HEADER FILES
COUT
CLRSCR
GETCH
COMPILE A PROGRAM
EXECUTE A PROGRAM

1. C++ Language By:-AAKASH KAUSHIK #9289817971, 98919893083 [email protected]

2. UNIT -2 BASIC STRUCTURE OF A C++ PROGRAM

3. BASIC STRUCTURE OF A C++ PROGRAM #include< iostream.h > #include< conio.h > void main() { clrscr (); Program code will be written here getch (); } AAKASH KAUSHIK 9891983083,9289817971

4. # # is called Preprocessor directive Preprocessing Preprocessing is the phase of compilation before the actual execution. # include< iostream.h > AAKASH KAUSHIK 9891983083,9289817971

5. These are the header file inclusion statement Header Files Header files are the predefined files in the C++ library using which we create new program. #include< iostream.h > #include< conio.h > AAKASH KAUSHIK 9891983083,9289817971

6. This is the main() method/ function of a C++ program. Actual execution of a program starts from main method. void main() AAKASH KAUSHIK 9891983083,9289817971

7. First C++ Program #include< iostream.h > #include< conio.h > void main() { clrscr (); cout <<“My First C++ Program”; getch (); } TO COMPILE- Alt+F9 TO EXECUTE-Ctrl+F9 VIEW OUTPUT AAKASH KAUSHIK 9891983083,9289817971

8. iostream.h Iostream stands for Input Output Stream It contains functions related to input and output. For ex.- cout,cin etc. AAKASH KAUSHIK 9891983083,9289817971

9. conio.h conio stands for Console Input Output . It contains functions related to Console screen input and output. The output screen of C++ is called Console Screen. AAKASH KAUSHIK 9891983083,9289817971

10. clrscr (); Function defined within conio.h file It clears the previous output screen. AAKASH KAUSHIK 9891983083,9289817971

11. cout <<“ text to be display”; Defined within iostream.h The text written within double quotes(“ ”) will got displayed on the output screen as it is. AAKASH KAUSHIK 9891983083,9289817971

12. getch (); Function defined within conio.h file It holds the final output screen until any key is pressed by user. AAKASH KAUSHIK 9891983083,9289817971

13. RULES OF C++ LANGUAGE Every program should have main() Every statement should be end with semicolon(;) This Language is case sensitive All the letter should be in lowercase. AAKASH KAUSHIK 9891983083,9289817971

14. Escape sequences \n – New Line \t - Horizontal Tab \a - beep // - / /’ - ’ /” - ” \0 –Null AAKASH KAUSHIK 9891983083,9289817971

15. Comments in a C++ Program Comments are used to increase understandability and readability of a program. These comments will be ignored by the compiler at the time of compilation/execution. i.e , comments are part of a program but not the part of compiled/executed code. AAKASH KAUSHIK 9891983083,9289817971

16. Type of Comments SINGLE LINE COMMENT Starts with // and treats all the contents following // as comments within that line MULTIPLE LINE COMMENT Starts with /* and ends with */ and all the contents in between will be treated as comments AAKASH KAUSHIK 9891983083,9289817971

17. COMMENTS USAGE EXAMPLE /* TITLE :- MY FIRST C++ PROGRAM CREATED BY :- XYZ */ #include< iostream.h > #include< conio.h > void main() { clrscr (); // to clear the output screen cout <<“My First C++ Program”; getch (); //to pause the final output } AAKASH KAUSHIK 9891983083,9289817971

18. THANK YOU AAKASH KAUSHIK 9891983083,9289817971