Function Basics Drill A

Problem 1 - Triple Number

Write a function that returns the result of tripling an input number

Function input: number
Function output: input tripled (a number)

Assign the function to a variable named "tripleNumFct".

Example Hand Calculation:

x = 10
tripleNumFct(x) = 3 * 10 = 30

Problem 2 - Cube Number

Write a function to cube a number.

Function input: number
Function output: input cubed (a number)

Assign the function to a variable named "cubeFct".

Example Hand Calculation:

x = 3
cubeFct(x) = 3 * 3 * 3 = 27

Problem 3 - Get Last Element

Write a function that returns the last element in the input array.

Function input: array
Function output: last element in array

Assign the function to a variable named "getLastFct".

Example Hand Calculation:

array = [10, 20, 30, 40]
getLastFct(array) outputs 40

Hints:

array.size() returns the size of the array
Array indexes are zero-based (start at 0)

Problem 4 - Max of Trio

Write a multi-line function that returns the max of three numbers.

Function input: three numbers
Function output: a number which is the max of the input numbers

Assign the function to a variable named "maxFct".

Example Hand Calculation:

a = 10
b = 11
c = 3
maxFct(a, b, c) outputs 11

Problem 5 - Min of Array

Write a multi-line function that returns the min number in an array

Function input: array of numbers
Function output: a number which is the minimum number in the input array

Assign the function to a variable named "minFct".

Example Hand Calculation:

array = [10, 5, -17, 3];
minFct(array) outputs -17

Problem 6 - Average String Length

Write a function that returns the average length of a collection of strings

Function input: array
Function output: average length of the input collection of strings

Assign the function to a variable named "getAveStringLength".

Example Hand Calculation:

array = ['Asha', 'Chin', 'Mo', 'Acheampong'].
getAveStringLength(array) outputs 5
//total length=20, count=4

Hints:

aString.length returns the length of a string

Problem 7 - Factorial

Write a multi-line function that returns the factorial of an input number

Function input: number
Function output: a number which is the factorial of the input number

Assign the function to a variable named "factorialFct".

Also see: factorial on mathisfun.com

Example Hand Calculation:

num = 4
factorialFct(num) outputs 24
//4 * 3 * 2 * 1