MATH 1P98 Lecture Notes - Lecture 6: Cosc, Instance Variable, Local Variable

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magentamammoth714

27 Feb 2020

School

Brock University

Department

Mathematics and Statistics

Course

MATH 1P98

Professor

Chantal Buteau

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$MATH 1P98 Full Course Notes$

MATH 1P98 Full Course Notes

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Cosc 1p02 tutorial exercise 3 feb 4th, 2020. In this exercise we will look at the concepts of scope and parameter passing. Scope rules define which declaration (which actual storage location) is associated with each use of a variable (or other) name. The text (section 3. 6) describes four rules for resolving scope (finding the declaration to which a use refers): Look for a declaration of the name in the method (or constructor) in which the code resides. If one exists, this is the defining declaration. This rule applies to both formal parameter declarations and local declarations. If no such declaration exists, apply step 1 looking in the immediately enclosing code unit normally this would be a class declaration. If no such declaration exists, check the public declarations of public classes from imported packages. This is how the names turtle, forward, pi, and sin that are imported from the media and math packages are resolved.

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.

MATH 1P98 Lecture Notes - Lecture 6: Cosc, Instance Variable, Local Variable

MATH 1P98 Full Course Notes

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