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CSE 142 Lecture 2: 2 Introduction to CSE 142

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Verified Note
whitecricket189
28 Sep 2018
School
UW
Department
Computer Science
Course
CSE 142
Professor
Brett Wortzman

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CSE 142 verified notes
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CSE 142 Lecture 1: 1. Introduction to CSE 142

2

CSE 142 Lecture 2: 2 Introduction to CSE 142

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CSE 142 Lecture Notes - Lecture 3: Semicolon

Document Summary

Week 1 class 2 (cid:1006) introduction to cse (cid:1005)4(cid:1006) I(cid:374) refere(cid:374)(cid:272)e to the (cid:862)helloworld(cid:863) program, public class helloworld{ public static void main(string[] args) { Statements are (cid:862)(cid:272)ode that does so(cid:373)ethi(cid:374)g(cid:863) - system. out. println() Strings are (cid:862)text that is goi(cid:374)g to (cid:271)e pri(cid:374)ted out(cid:863), a(cid:374) i(cid:374)put to the state(cid:373)e(cid:374)t (cid:862)hello, world! (cid:863) Inefficient code (will only score about 11 or 12 out of 20): public class diamondcross_1 { public static void main(string[] args) { We can make the code more efficient by assigning methods. A method is (cid:862)a chunk of code that i can give names to. (cid:863) This method has assigned the statement figure1 to print out: Afterwards, we can call out from figure1 by writing down figure1(); Thus, methods allow us to improve the efficiency of our code by removing redundancy. Efficient code (will score about 15 to 16 out of 20): public class diamondcross_2 { public static void main(string[] args) { diamond(); space(); diamond (); space();

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Related Questions

5. Consider the following class: import java.util.Scanner; public class Money private int dollars; private int cents; public Money (int d, int c) { dollars = d; cents = c; /* Point 1 */ public String toString() { String result; if (cents > 100) int totalCents = dollars * 100 + cents; dollars = totalCents / 100; cents = total Cents % 100; /* Point 2 */ /* Point 3 */ result = "$" + dollars + ", " + cents + "C"; return result; public static void main(String[] yourGrandfather) Scanner keyboard - new Scanner (System.in); Money amount; int C; /* Point 4 */ System.out.print("Enter an amount in cents: "); C = keyboard.nextInt (); amount = new Money (c/ 100, CX 100); System.out.println("You have: " + amount.toString()); The above program compiles and runs without error. Which variables are in scope at each of the points marked by comments in the above class? In other words, if each of these comments were replaced by an actual Java statement, which variables could be used in this statement without a prefix (that is, without having to write the name of a class or other variable in front of the variable name) and without the compiler reporting an unknown variable error? List each variable that is in scope at each of the points marked by comments in the above class, and indicate whether it is an instance variable, a formal parameter, or a local variable. Note that you will be penalized for every variable that is out of scope at a given point but that you list as being in scope at that point.