Variables And Assignments

Question 1

What does = mean in programming?

Answer 1

It assigned a value, IT DOES NOT MEAN EQUALS

X = 5 assigns the value 5 to the variable x

Question 2

What does a variable declaration do?

Answer 2

Declares a new variable, specifying the variables name and type.

Question 3

What is a name for a variable or function?

Answer 3

Identifier

Question 4

An identifier must:

Answer 4

Be a sequence of letters (a-z, A-Z), underscores, and digits
Start with a letter

Question 5

what are reserved words? Give examples

Answer 5

Words that are part of the language

Integer, Get, Put

Question 6

List of reserved words:

Answer 6

Get
Put
To
From
Input
Output

Integer
Float
Array
And
Or
Not

Question 7

List of reserved function names:

Answer 7

RaiseToPower
SquareRoot
AbsoluteValue
RandomNumber
SeedRandomNumbers

Question 8

What is an expression?

Answer 8

A combination of items, like variables, literals, operators, and parenthesis that evaluates to value and commonly used on the right side of an assignment statement.

X = 2 * (x + 1)

Question 9

What is a literal?

Answer 9

A specific value in code, like ‘2’.

Question 10

What is an operator?

Answer 10

A symbol that performs a built-in calculation, like ‘+’ which performs addition.

Question 11

In programming, can multiplication be indicated like this: 2x

Answer 11

No, it must be indicated explicitly, 2 * x

Question 12

In y = x + 1, what is the expression?

Answer 12

X + 1

Question 13

What is a -minus known as in programming?

Answer 13

Unary minus

Question 14

Are commas allowed in an integer general?

Answer 14

No

Question 15

What is incremental dev?

Answer 15

Process of writing, compiling, and testing a small amount of code, then writing, compiling, and testing a small amount more, and so on.

WCT

Question 16

What is a floating point number?

Answer 16

A real number, like 98.6, 0.0001 and refers to the decimal point being able to appear anywhere.

It is a data type that represents a real number with a fractional component.

Question 17

What is a floating point literal?

Answer 17

A specific representation of a floating point number as written in a program or source code. It can be a decimal or exponential notation.

It is a specific representation of a value of this data type in a program or source code.

Question 18

What may a floating point variable that holds the value 299792458.0 be printed as?

Answer 18

2.99792e+08

Question 19

Floating point variables are used when dealing with _____________.

Answer 19

Fractions of countable items, such as the average number of cars per household, avg. distances, and avg. weights

Question 20

By default most programming languages output at ___ digits after the decimal point.

Answer 20

5 (five)

Question 21

Is this a valid function? Why or why not?

Y = SquareRoot (2.0, 8.0)

Answer 21

No, because SquareRoot () only accepts one argument.

Question 22

If the growth rate of a tree is 5% per year, what is the float number the program computes?

Answer 22

1.05

Question 23

What two arguments does RandomNumber () take?

Answer 23

LowValue and highValue

Question 24

What type of number does RandomNumber () return?

Answer 24

A random integer in the range lowValue to highValue

Question 25

How is plus one used with RandomNumber (10, 20)?

Answer 25

20 - 10 + 1 which equals 11

Question 26

What does pseudo mean?

Answer 26

Not actually, but having the appearance of.

Question 27

When no previous integer exists for RandomNumber(), what built in integer is used?

Answer 27

Seed

Question 28

When the operands of / are both integers, what is performed?

Answer 28

Integer division

Question 29

What is 10 / 4?

Answer 29

2, not 2.5 because integer division does not generate fractions

Question 30

What is the answer when dealing with integers (5+10) * (1/2)?

Answer 30

0, it will always be 0 because integer division does generate fractions

Question 31

For integer division, what occurs if the second operand of / or % is 0 (zero)?

Answer 31

A divide-by-zero error occurs at runtime, causing a program to terminate

Question 32

What is a defining feature of an integer?

Answer 32

A thing is countable. People in a room, cars in a parking lot, number of births per year.

Question 33

What is a type conversion? Give an example.

Answer 33

Conversion of one data type (integer) to another (float). 25 becomes 25.0 4.9 becomes 4

Question 34

For an equation with + or *, what happens when one of the operands is a float?

Answer 34

The arithmetic operand is automatically converted to a float, then a floating point operation is performed.

Question 35

What does a type cast do?

Answer 35

Converts a value of one type to another type.

Question 36

What does the modulo operator (%) do?

Answer 36

Evaluates to the remainder of the division of two integer operands 23 % 10 is 3

Question 37

Any odd number % 2 equals?

Answer 37

1

Question 38

What is a constant?

Answer 38

A named value whose value cannot change

Question 39

What is a good practice when naming constants?

Answer 39

Using all caps separated by underscores ALL_CAPS