Introduction to Computer Programming

1. Introduction to Computer Programming CS 126 Lecture 6 Zeke Maier

2. Plan for Today • Questions • Administrivia • Quiz • Instance Variables • Conditionals • Assignment

3. Questions

4. Administrivia • http://students.cec.wustl.edu/~ejm3/ • Lab assignment due Wednesday

5. Method Example Code • http://students.cec.wustl.edu/~ejm3/CS126/web/code.html#instance • Pay attention to the coding style!

6. Variables • Def: A symbol which can hold a value of a particular type <dataType> <name>; int count;

7. Instance/Data Variables • How do we create an instance variable? <dataType> <name>; int count; • Which variable is the instance variable? class Student { String name; public static void main(String args[]) { } void printName() { String fullName = “Mr./Ms. ” + name; System.out.println(“Name: ” + name); } }

8. Class Layout • A Class is a blueprint for an object • It models something • Class consists of: • Instance/Data Variables • Describe • Methods • Perform Actions

9. Instance Example Code • http://students.cec.wustl.edu/~ejm3/CS126/web/code.html#instance

10. Conditional Statements • Allows us to change the behavior of the program based on certain conditions • Example: absolute value If (condition) { //Statements to execute if the condition is true } else { //Statements to execute if the condition is false }

11. Assignment • Lab 1 due Wednesday in Lab • Readings • Wednesday • AD Chapter 4: 4.1 - 4.7 • KG Notes