Programming Chapter 6

Front 1

Function

Back 1

A special type of module whose purpose is performing a specific task.

Front 2

What happens when a program finishes?

Back 2

The function returns a value back to the part of the program that called it and then can be used like any other value.

Front 3

How are values used?

Back 3

1. Assigned a variable
2. Displayed on screen
3. Used in a mathematical expression

Front 4

Library Functions

Back 4

Built in functions that have already been written into the into the programming language that you can call anytime you need them.

Front 5

Benefits of library functions

Back 5

Makes programming easier because these functions perform many of the taks that programmers commony need to perform.

Front 6

Examples of what library functions do

Back 6

manipulate numbers, perform various math operations, convert data from one type to another, manipulate strings, etc.

Front 7

What happens when you call a function?

Back 7

The compiler/interpreter automatically causes the function to execute without requiring the function's code to appear in your program

Front 8

What do you need to know when using library functions?

Back 8

1. Purpose of the library function
2. Arguments you must pass to it
3. The type of data it returns

Front 9

Black Box

Back 9

Any mechanism that accepts input, performs some operation that cannot be seen on the input, and produces output.

Front 10

random Function

Back 10

A library function that generates random numbers.
randomize() in vb

Front 11

Uses for the random function

Back 11

Useful for simulation programs - formulas can be constructed in which a random number is used to determine various actions and events that take place in the program.

Front 12

Calling a random function

Back 12

set number = random(1, 100)
When the function is called, it will generate a random number 1-100 and then return the number, which is then assigned to the number variable.

Front 13

Custom Functions

Back 13

Essentially modules/subroutines that allow you to send a value back to the part of the program that called it

Front 14

Function Header

Back 14

1. Specifies data type of returned value
2. Name of the function
3. Parameter variables used to accept arguments

Front 15

Function Body

Back 15

One or more statements that execute when the function is called

Front 16

Return Statement

Back 16

Statement in the body which specifies the value that is returned from the function when it ends.

Front 17

Parts of a Function Header

Back 17

dataType of return value and function name

Front 18

Return Value

Back 18

Last line of the body. Value that the function sends back to the part of that calls the function

Front 19

How many arguments can you pass into a function?

Back 19

As many arguments as you need, but you can only return one value.

Front 20

Uses of Functions

Back 20

1. Can prompt user for input and then return the value entered by the user
2. Simlify complex mathematical expressions

Front 21

IPO Chart

Back 21

Input, processing, output. Describes the input, processing, and output of a function. Used to design functions.

Front 22

Uses of Boolean Functions

Back 22

Help to simplfy complex conditions that are tested in decision and repetition structures (roulette game, hello!)

Front 23

Designing Boolean Functions

Back 23

The function accepts a number as an argument and returns "True" if the conditions are true, or "False" if the conditions are otherwise. (cool!)

Front 24

Mathematical Library Functions

Back 24

Many programming languages offer many mathematical functions in the library.

Front 25

Data Type Conversion Functions

Back 25

Library Functions that convert values from one data type to another. Example: toInteger. See page 243 for these functions

Front 26

Type Mismatch Error

Back 26

An error that occurs when a programmer tries to assign a value of one data type to a variable of another data type.

Front 27

Length Function

Back 27

returns the length of a string

Front 28

Append Function

Back 28

accepts two strings as arguments and returns a third string that is created by appending the second string to the end of the first string. This is called "concatenation"

Front 29

toUpper Function

Back 29

accepts a string as an argument and returns a copy of the argument as uppercase

Front 30

toLower Function

Back 30

same as toUpper but converts the copy to lowercase instead

Front 31

Substring Function

Back 31

substring is a string within a string and the function returns sections of the string that you wish to call back

Front 32

Contains Function

Back 32

accepts 2 strings as arguments, returns True if the first string contatins the second string

Front 33

stringToInteger Function

Back 33

Converts a string to an integer

Front 34

stringToReal Function

Back 34

Converts a string to an integer

Front 35

isInteger Function

Back 35

determines whether a string can be converted to an integer

Front 36

isReal Function

Back 36

determines whether a string can be converted to a real