CSE 1020: Introduction to Computer Science I Mark Shtern

Course Objective Developing development skills Writing Java Multiclass application Introducing the software engineering concern Study UML, OOP, API

Example 01 Write application that calculates rectangle area

Example 02 Write application that calculates volume of rectangle couboid

Math & Computers Algebraic laws (a*b) /c is equal to a * (b/c)

Ex 1.16 What is program output? char grade= ‘B’; System.out.print(grade); { grade = ‘C’; } System.out.println(grade);

Ex 1.17 Explain the compile-time error long speed = 1; int size = 7; { boolean even = false; long speed = 5; size = 2; } int even = 3; System.out.println(speed); System.out.println(size); System.out.println(even);

Ex 1.17 What is output? long speed = 1; int size = 7; { boolean even = false; size = 2; } int even = 3; System.out.println(speed); System.out.println(size); System.out.println(even);

Summary Types Declaration Arithmetic Operations Casting Scope +,-,/,* ,% (remainder) Casting Scope

Shortcuts a++  a=a+1 a--  a=a-1 a+=6  a=a+6 a*=6 a=a*6

Literal Real Boolean Character 7D or 7d  7 is double 2.5E 3  2.5*10^3 or 2500.0 Boolean true or false Character ‘\t’ , ‘\n’, \’, ‘\\’,’\”’

Program Execution Edit Compile Run

Java Program Byte code Compile-time Errors VM CPU Byte code javac java instruction

Ex 1.18 Is it true that expression a * b * c/d (1) is evaluated as

Ex 1.21 Explain the compile-time error int i = 6; long l = 4; double d = 12; l = i + i; d = i + i; i = l + l; l = d + d;

Ex 1.22 Explain the compile-time error or predict its output int x = 3; int y = 14; double pie = x + y / 100.0; int z = (5 % 4) + 6 / 8; System.out.println (pie); System.out.println(z);

Math & Computer sqrt(x^2) vs (sqrt(x))^2 (1/x) * x vs x * 1/x

Char Type What is output? char letter = ‘D’; letter = (char) (letter +1); System.out.println(letter); ------------------------------------------ char letter2 = ‘A’; System.out.println(letter2 - letter);