1. CSE 1020: Introduction to Computer Science I
Mark Shtern

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

3. Example 01
Write application that calculates rectangle area

4. Example 02
Write application that calculates volume of rectangle couboid

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

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

7. 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);

8. 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);

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

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

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

12. Program Execution
Edit
Compile
Run

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

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

15. 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;

16. 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);

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

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