Lecture01
- 1. Lecture 01 Introduction to Programming Techniques
- 2. What are the Program Organizing Techniques ? There are four different techniques, they are
- 3. Unstructured Programming Working: Main program directly operates on global data. Impractical when the program gets large. The same statement sequence must be copied if it is needed at different places. …. EG: for (I=1;I<=10;I++) ….. cout << ‘*’; DIS : Program becomes large …..
- 4. Structured Programming (Procedural Programming) main program procedure Main ( ) { add( ); subtract ( ); } Add ( ) Combine a sequence of statements into a procedure with calls and returns. { ……} Subtract( ) { …..}
- 5. Structured Programming (cont.) Main program coordinates calls to procedures and hands over appropriate data as parameters.
- 6. Modular Programming Procedures of a common functionality are grouped together into separate modules. Main program coordinates calls to procedures in separate modules and hands over appropriate data as parameters.
- 7. Problems with Structured and Modular Programming Unrestricted access to global data. Poor modeling of the real world. (Attributes and behavior are separated - data and methods are separated) Can’t create new data type easily.
- 8. Object-Oriented Programming • Combine data and functions into object. (Member Data & Member Functions) • Member functions are also called methods. • Member data are hidden within member functions. • Data Encapsulation & Data Hiding. • Objects interact by sending messages to each other.
- 9. Object-Oriented Programming (cont.) • Object-Oriented Model