U3: User Defined Methods

Question 1

Trial and Error

Answer 1

Create program, run it, alter code until desired result

Question 2

Stepwise Refinement

Answer 2

• Completing program in trial-and-error method closer and closer to solution
• Ex: Writing first part of program, perfecting, then continuing

Question 3

Divide and Conquer

Answer 3

Breaks task into smaller parts

Question 4

Modular Programming

Answer 4

• Building large programs through combining separate chunks of code
• Possible by creating main program, then creating separate subroutines for program

Question 5

Method Header

Answer 5

• public static void [method] (data)
• AKA: Subroutine definition

Question 6

Method Body

Answer 6

Code of the method

Question 7

Modifiers

Answer 7

Ex: public and static

Question 8

public/private

Answer 8

• Access specifier stating where subroutine can be called from
• Private: Just within selected part of program
• Public: Other parts

Question 9

Naming Conventions for Subroutine

Answer 9

• Begin with lowercase
• Camel notation
• Descriptive name
• No reserved words

Question 10

Static

Answer 10

Ensures subroutine can exist on own and not as part of object

Question 11

Local Variables Inside Subroutine

Answer 11

• Different, simpler name from ones in main program
• Only exist within subroutine
• Wiped from memory when subroutine done executing

Question 12

Program Control for Subroutine

Answer 12

• Program control transferred to subroutine when latter is called
• Transferred to main program when subroutine done executing

Question 13

Procedure

Answer 13

Performs task but doesn’t return data to main program; returns void

Question 14

Data Transfer from Main Program to Subroutine

Answer 14

Write arguments in brackets in same order as parameters

Question 15

Function

Answer 15

• Performs task and returns data to main program
• Return type specified and return statement concludes subroutine

Question 16

Return Types

Answer 16

Int, Double, String, Void, etc

Question 17

void

Answer 17

Used when no data returned to main program

Question 18

Return Statement

Answer 18

return (variable);

Question 19

Outputting Data from Method Call

Answer 19

• Output to screen on the same line as the method call OR
• Use variable in main program to store data

Question 20

Methods

Answer 20

• Declared within main class
• Include both procedures and functions
• Can’t return +1 piece of data

Question 21

Declaring Parameter

Answer 21

Done while declaring subroutine

Question 22

Declaring Argument

Answer 22

Done while calling subroutine

Question 23

Declaring Variables on Same Line

Answer 23

Possible for same data type in the main program, not in subroutines

Question 24

Subroutine Header

Answer 24

Comments explaining subroutine function, inputs and outputs, parameters passed, data returned (if any).