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CSC141 Computer Science I

CSC141 Computer Science I. Zhen Jiang Dept. of Computer Science West Chester University West Chester, PA 19383 zjiang@wcupa.edu. Table of Contents. Introduction Plain text format printout Variable and its value type Expression & operator Math.pow & Math.sqrt Combined assignment

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CSC141 Computer Science I

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

  2. Table of Contents • Introduction • Plain text format printout • Variable and its value type • Expression & operator • Math.pow & Math.sqrt • Combined assignment • DecimalFormat • String

  3. Welcome • Why this class? • Job hunting • WCU graduated, Database, Software Engineering, … vs. • UPenn, Temple, Drexel, … • Something help you to stand out! — How do you like to be introduced?

  4. Research project • Critical thinking, communication, well-plan, etc. • Real competition, deadline, pressure • More realistic system, complex programming, for instance, http://www.cis.temple.edu/~jiang/RSU_Van.pptx. • Student opportunities: http://www.cs.wcupa.edu/~zjiang/student_info.htm • Sponsorship • NSF, NSA, etc • Industry interns

  5. Student Opportunities Collaboration at international level Course project NSF REU Collaboration at inter-disciplinary level Collaborative work at inter-department level

  6. Industry partners • Such as Gnostech, Chase, etc. • Invited talks in courses • Seminars or guest speeches • Curriculum review/assessment • Permanent intern opportunities

  7. Goal • Competitive students entrepreneurially and computationally empowered citizenries • Temple, NYU, etc. • IBM, SAP, Vanguard, Bell lab, etc. Key • Attract students and keep them continuously working hard Strategy • Real-world computing paradigms and principles in an obstacle-less learning

  8. No pain, no gain • Need to handle those things coming from pressure: frustration, upset, madness, etc. • Looking for solution, not excuse. • Deadline!

  9. Highlights in class materials (available on class website) • Textbook • Thinking process (instead of resultant program) • Hands-on experience • Happy ending!

  10. Print-out • Code 2-1 (Welcome.java), 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 • Java is case-sensitive

  11. What a println statement (one statement only) will generate the following output (one statement only)? This program prints a quote from the Gettysburg Address. "Four score and seven years ago, our 'fore fathers' brought forth on this continent a new nation." What aprintln statement (one statement only) will generate the following output? A "quoted" String is 'much' better if you learn the rules of "escape sequences." Also, "" represents an empty String. Don't forget to use \" instead of " ! '' is not the same as "

  12. Variable • Code 2-7 (Variable.java), 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

  13. Assignment • Assignment • Left is a single variable • Right is a legal expression • Initialization, page 53 • Value of variable, page 53 • Execution time line, page 55

  14. Expression • Operator (Increment.java) • Complete list, Table 2-7, page 55 • Precedence order, table 2-8, page 58 • Prefix/postfix increment (decrement), page 190-191 • n[x][y][pd].counter[type]++ • Casting, page 65 • 17/3=? • 17.0/3=? • (double)17/3 = ?

  15. Types, Code 2-10, page 46 • Sample, Code 2-18, page 59 • 10% off?

  16. Discrete Types byte short int long Continuous Types float double Non-numeric Types boolean char

  17. double float long int boolean short char byte

  18. Advanced techniques • Math.pow and Math.sqrt, page 62 • Combined assignment, table 2-13, page 64 • Scope, page 75-77

  19. Keyboard Input • Code 2-29 (Payroll.java), page 87

  20. String • Displaying message, Code 2-32, page 94 • Input, converting a string to number, Code 2-33 (PayrollDialog.java), page 97 • String to Number • Parse, table 2-18, page 96 • String value of, table 9-7, page 581 • Number to String – Simple! • 12+ “”

  21. String processing • StringDemo.java • indexOf, table 9-4, page 572 • substring, table 9-5, page 575 • Length, Code 2-21, page 73 • charAt, toLowerCase, toUpperCase, Code 2-22, page 74 • Sting.valueOf, table 9-7, page 581

  22. Example • Ex 4 • Self-evaluation questions: • Merge 2 strings a and b? • Split 1 string into 2 parts? • Cut the head? • Cut the tail? • Take the middle? • Search?

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