1. CSC141 Computer Science I Zhen Jiang Dept. of Computer Science
West Chester University
West Chester, PA 19383

2. Table of Contents Introduction Plain text format printout
Variable and its value type
Operator
Math.pow & Math.sqrt
Combined assignment
DecimalFormat
Prefix/postfix increment

3. Welcome Code 2-1, page 27 Names Main { } and ( )
Println and print (Code 2-3, page 35)
\n (Code 2-5, page 36), \t (Code 2-6, page 37), and table 2-2.
// (not \\) , page 77

4. Variable Code 2-7, page 39 Type (declaration) Name, page 43
Begin with [a]-[Z], or _, or $
Contain only [a]-[Z], [0]-[9], _, and $
No keyword
Case distinct
Samples, table 2-4, page 43

6. Assignment Assignment Left is a single variable
Right is a legal expression
Initialization, page 52
Value of variable and execution time line, page 53

7. Expression Operator, Code 2-8, page 40, Table 2-7, page 55
Precedence order, table 2-8, page 58
Prefix/postfix increment (decrement), page
n[x][y][pd].counter[type]++
Casting, page 66
17/3=?
17.0/3=?
(double)17/3 = ?
Types, Code 2-10, page 46
Sample, Code 2-18, page 60
10% off?

8. Advanced techniques Math.pow and Math.sqrt, page 62 Math.PI, page 70
Combined assignment, table 2-13, page 63
Scope, page 75

9. Keyboard Input
Code 2-29, page 87

10. String Displaying message, Code 2-32, page 94
Input, converting a string to number, Code 2-33, page 97
Value of, page
Parse, table 2-18, page 96
Output
converting a number to string, toString, page 603
DecimalFormat, Code 3-21,22,23,24, page

11. String (continue…) indexof, page 574 Substring, table 9-5, page 577
Concat, Table 9-6, page 581
Replace, Table 9-6, page 581
Length, Code 2-21, page 73
Sting.valueOf, table 9-7, page 583

12. Example
String split
“ ” => “12.123”