COMP 202 Study Guide - Final Guide: Khanqah, Dynamic Array, Opata Language

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maroonmanatee800

23 Nov 2015

School

McGill University

Department

Computer Science (Sci)

Course

COMP 202

Professor

Melanie Lyman- Abramovitch

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COMP 202 Full Course Notes

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Variables: give a variable a name and a type. Type = kind of data (int, double, string etc. keyboardreader is the same: a variable you create inside a block of code is not the same outside that block. Types of variables o o o o o o o. Boolean (<= 1byte) : store true or false. Byte(1) : can only store between( -128 and 127) Short(2) : small numbers (-32,768 < x < 32,767) Char(2) : stores one character (0 < x < 216 1) To store you need to do char x = \"" (\) is also used to store new line (\n) Example: 3. 0f (approx) +/- 3. 4 * 1038: double (8) : stores fractions (approx) +/- 1. 8 * 10308. 3. 0 is considered a double; 64 bits mem o. String : letters: inside method, variables defined in the method header will have value of expression passed to them: math. pow(3, 4. 0 + 3)

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.

COMP 202 Study Guide - Final Guide: Khanqah, Dynamic Array, Opata Language

COMP 202 Full Course Notes

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