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Exam 19: Programming Functions

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Question 1

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Select all that apply . What does the following command do? Ctx . quadraticCurveTo(20,20,20,50) ;

A) The curve will end at the point where x = 20 and y = 50
B) The curve will start at the point where x = 20 and y = 20
C) It specifies a curved line .
D) The curve will start at the point where x = 20 and y = 50

E) All of the above
F) B) and D)

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Question 2

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The numbers generated by the Math . random() function

A) will never be repeated
B) are random because a computer is deterministic
C) must be multiplied by -1 to change them to positive
D) are pseudo-random

E) C) and D)
F) A) and D)

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Question 3

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When two variables have the same name, but one is global and one is local, the JavaScript program will not run .

The HTML ________ tag provides an area where JavaScript can draw lines and figures .

When you write code to ask the computer to run or execute the statements in a function, this is referred to as ________ the function .

Programmers rarely use code written by others .

What, if anything, is wrong with the following JavaScript code? <script>document . write("<img src = 'puppy . JPG'/>") ;</script>

Output directly onto a web page from JavaScript is done using the ________ built-in function .

Given the following JavaScript function, which of the following is NOT a possible result? Function tossIt() { Return Math . random() ; }

A(n) ________ is a programming structure with a name, an optional parameter list, and a definition that encapsulates an algorithm .

If you wanted the following function to return only the two values of 0 and 1, how would you re-write line 2? 1 ) function tossIt() { 2 ) return Math . random() ; 3 ) }

When calling a function, it does not matter which order you list the arguments .

When a function is called, you write the function's name and include any necessary arguments (that is, input values) inside ________ .

A variable cannot be used as part of a calculation to assign a value to itself . For example, this JavaScript statement would cause an error, assuming myNum is a numeric variable that has been previously declared and initialized:myNum = myNum*3 + 75/myNum;

Select all that apply . Which of the following are required parts of a function?

If a function definition contains two parameters, two arguments must be included in the function call .

The inputs to a function are called

Functions that are written so they can be reused in other programs are considered ________ .

Variables in the parameter list of a JavaScript function are declared automatically .

The arguments in a function call pass values to the parameters, matched in order from left to right .