Variables, Constants and operators

On the left-hand side is a set of terms. On the right-hand side is a set of statements or definitions.

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Stores multiple characters
Stores whole numbers
Stores decimal numbers
Real number using 4 bytes to hold up to 6 decimal places
Real number using 8 bytes to store 15 decimal places

String

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Integer

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Real	Correct Incorrect Correct answer

Float

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Double

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Instructions

Below are a number of statements. Tick the answers that are correct only

TRUE is a valid value for Boolean data

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165 can be stored as a Boolean

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165 can be stored as an integer

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165.01 can be stored as an integer

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165.01 can be stored as a string

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AND is a valid value for Boolean data

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Floats and doubles are types of integer

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Strings can contain any type of character

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Strings cannot contain numbers

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Floats use less memory than doubles

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If you convert real data into integer data, everything after the decimal point will be discarded

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Explain why the programmer must give the variable a name?

The programmer gives each variable a name to call it.

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The programmer gives each variable a name to identify it. This name is used by the program to find the memory location where the variable’s data is stored, in order to read or modify it.

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The programmer gives each variable a name to save data.

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Explain why the programmer must give the variable a name?

The programmer gives each variable a name to call it.

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The programmer gives each variable a name to identify it. This name is used by the program to find the memory location where the variable’s data is stored, in order to read or modify it.

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The programmer gives each variable a name to save data.

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Numerical data can be stored as an integer, real or string data type. State the difference between these three data types?

This response will be awarded full points automatically, but it can be reviewed and adjusted after submission.

Use the words in the table below to fill-in-the-gaps in the text. Each word may only be used once.

MEMORY	CONSTANT	ARGUMENT	DATA
SPACES	SOURCE	OPERATING	COMPARE
BOOLEAN	NAME	OR	UNDERSCORE
RUNS	OPERATORS	CHANGED	ARITHMETIC

One of the tasks of a computer program is to be able to keep track of changing BLANK 1 of 16. This job is performed through the use of variables. Programmers give variables a sensible BLANK 2 of 16 so that they can be easily identified. The name is then used by the program to find the BLANK 3 of 16 location where the variable’s data is being stored. The data stored in that variable can then be read, modified and used within the program. By naming variables you do not need to know, or care, where in memory that variable is being stored, the BLANK 4 of 16 system will take care of it. When using variables there are certain naming conventions. BLANK 5 of 16 should never be used, instead, if multiple words are required then either capital letters at the start of each word, or an BLANK 6 of 16 between words, should be used. Variables enable their contents to be BLANK 7 of 16 whilst the program is being run. However, some values do not ever need to be changed and so for these, a BLANK 8 of 16 is used. A constant has a label or name to identify it and its value cannot be changed as the program BLANK 9 of 16. Not being able to change the value can be advantageous as it means that the data held within the constant cannot be accidentally altered. Another advantage is that if the value does ever need to be changed then it only has to be altered in one place. However, this does have to be done via the BLANK 10 of 16 code. Computer programs are able to carry out calculations and BLANK 11 of 16 data. This is possible through the use of BLANK 12 of 16. There are several types of operator, BLANK 13 of 16, boolean, assignment and compound operators. An operator always acts on at least one item. This item is called the ‘BLANK 14 of 16’ of the operator. BLANK 15 of 16 operators carry out a logical operation on their arguments. For example, AND returns TRUE only if both arguments are true. Whereas, BLANK 16 of 16 will return TRUE if either argument is true. NOT will return the inverse of the boolean argument. Assignment operators assign values to variables

MEMORY	CONSTANT	ARGUMENT	DATA
SPACES	SOURCE	OPERATING	COMPARE
BOOLEAN	NAME	OR	UNDERSCORE
RUNS	OPERATORS	CHANGED	ARITHMETIC

MEMORY	CONSTANT	ARGUMENT	DATA
SPACES	SOURCE	OPERATING	COMPARE
BOOLEAN	NAME	OR	UNDERSCORE
RUNS	OPERATORS	CHANGED	ARITHMETIC

One of the tasks of a computer program is to be able to keep track of changing Fill in the blank 1 of 16 . This job is performed through the use of variables. Programmers give variables a sensible Fill in the blank 2 of 16 so that they can be easily identified. The name is then used by the program to find the Fill in the blank 3 of 16 location where the variable’s data is being stored. The data stored in that variable can then be read, modified and used within the program. By naming variables you do not need to know, or care, where in memory that variable is being stored, the Fill in the blank 4 of 16 system will take care of it. When using variables there are certain naming conventions. Fill in the blank 5 of 16 should never be used, instead, if multiple words are required then either capital letters at the start of each word, or an Fill in the blank 6 of 16 between words, should be used.

Variables enable their contents to be Fill in the blank 7 of 16 whilst the program is being run. However, some values do not ever need to be changed and so for these, a Fill in the blank 8 of 16 is used. A constant has a label or name to identify it and its value cannot be changed as the program Fill in the blank 9 of 16 . Not being able to change the value can be advantageous as it means that the data held within the constant cannot be accidentally altered. Another advantage is that if the value does ever need to be changed then it only has to be altered in one place. However, this does have to be done via the Fill in the blank 10 of 16 code.

Computer programs are able to carry out calculations and Fill in the blank 11 of 16 data. This is possible through the use of Fill in the blank 12 of 16 . There are several types of operator, Fill in the blank 13 of 16 , boolean, assignment and compound operators. An operator always acts on at least one item. This item is called the ‘Fill in the blank 14 of 16 ’ of the operator. Fill in the blank 15 of 16 operators carry out a logical operation on their arguments. For example, AND returns TRUE only if both arguments are true. Whereas, Fill in the blank 16 of 16 will return TRUE if either argument is true. NOT will return the inverse of the boolean argument. Assignment operators assign values to variables

MEMORY	CONSTANT	ARGUMENT	DATA
SPACES	SOURCE	OPERATING	COMPARE
BOOLEAN	NAME	OR	UNDERSCORE
RUNS	OPERATORS	CHANGED	ARITHMETIC

Test

On the left-hand side is a set of terms. On the right-hand side is a set of statements or definitions.

Sort elements

A location in memory that holds one or more values
A value that cannot be changed while the program is running
A character representing a simple operation.
Mathematical operators: addition, subtraction, division, multiplication, modulus
Logical operators: AND, OR, NOT, XOR
Sets the value of an variable
Accepting data from the user for use in the program
Where information is changed .
Information is returned to the program

Variable

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Constant

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Operator

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Arithmetic Operator

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Boolean

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Assignment

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Input

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Processes

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Output

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test

Variables are stored in main memory truefalse
Variables store data values

You can change the value of constants while the program runs
X
Using constants helps improve code legibility
X
Using constants causes a program to run slower
X
String is a type of operator
X
Booleans are a type of operator
X
Modulus returns the remainder of a division
X
= is an arithmetic operator
X
= is a Boolean operator X
= is an assignment operator X
TRUE is a Boolean operator
X
NOT is a Boolean operator X
Output commands ask the user to enter data
X
21 % 3 == 7 X
Boolean operators always return either TRUE or FALSE
X

What is a variable?

A variable is a location in memory that holds one or more values. It has a label or name to identify it and its values can be changed as the program runs

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A variable is a location in CPU that holds one or more values. It has a no label or name to identify it and its values can be changed as the program runs

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A variable is a software that holds data.

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Variables, Constants and operators

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