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Chapter 9 - Unit 2

Fundamentals of QBASIC: Constants and Variables

Class 6 - APC Understanding Computer Studies


Fill in the blanks

Question 1

Alphanumeric variables always end with a dollar ($) sign.

Question 2

Numeric constants include only numbers.

Question 3

The maximum length of a variable is 12.

Question 4

Alphanumeric constants are always enclosed in double quotes.

Question 5

Variables always begin with alphabets.

Question 6

Comma is not allowed while writing numeric constants.

State whether the following statements are True/False

Question 1

A45 is a valid numeric variable.
True

Question 2

A+B is not a valid alphanumeric variable.
True

Question 3

Special characters are used in variables.
False

Question 4

Numeric constants are stored in numeric variables.
True

Question 5

0.5495 is a valid numeric constant.
True

Question 6

Decimals are not allowed in numeric constants.
False

Match the following

Question 1

S. NoColumn 1Column 2
1Numeric constantsAlphanumeric constants
2Alphanumeric variables representare always enclosed in " "
3Alphanumeric constantsmust begin with an alphabet
4A variableString variables
5Alphanumeric variables are calledcan take part in mathematical operations

Answer

S. NoColumn 1Column 2
1Numeric constantscan take part in mathematical operations
2Alphanumeric variables representAlphanumeric constants
3Alphanumeric constantsare always enclosed in " "
4A variablemust begin with an alphabet
5Alphanumeric variables are calledString variables

Name them

Question 1

Two types of variables

Answer

  1. Numeric variables
  2. Alphanumeric variables

Question 2

Two types of constants

Answer

  1. Numeric constants
  2. Alphanumeric constants

Correct the following expressions

Question 1

B$ = WORLD CUP 2007

Answer

B$ = "WORLD CUP 2007"

Question 2

"DELHI PUBLIC SCHOOL" = D$

Answer

D$ = "DELHI PUBLIC SCHOOL"

Question 3

$$A = "ARYA PUBLISHING COMPANY"

Answer

A$ = "ARYA PUBLISHING COMPANY"

Question 4

P$ = (A + B)2

Answer

P = (A + B) ^ 2

Question 5

4B$ = "NEW DELHI"

Answer

B4$ = "NEW DELHI"

Question 6

A = 4P + 5Q

Answer

A = 4 * P + 5 * Q

Question 7

AVG = (2A + 3B + 4C)/3

Answer

AVG = (2 * A + 3 * B + 4 * C) / 3

Question 8

A*B = AB + CD

Answer

AB = A * B + C * D

Write down the appropriate variables for the following

Question 1

_________ = "Understanding Information Technology"

Answer

UIT$ = "Understanding Information Technology"

Question 2

_________ = A * B * C

Answer

Product = A * B * C

Question 3

_________ = "15th August 1947"

Answer

Date$ = "15th August 1947"

Question 4

_________ = 1/2 * A + 1/4 * B

Answer

Ans = 1/2 * A + 1/4 * B

Question 5

_________ = 11.99

Answer

Num = 11.99

Define the following terms

Question 1

Variables

Answer

Variables change their values at the time of execution. A variable may be a single character or a set of characters.
For example: A, B, B10, C$ etc.

Question 2

Constants

Answer

Constants are data items, the values of which do not change at the time of execution of the program.
For example: 76, -43, "Hello", etc.

Question 3

Numeric variables

Answer

These are the variables which can store numbers or numeric values. They can also store integer and real type numeric values.
For example: A = 45.

Question 4

Alphanumeric variables

Answer

These variables are used to store alphabets, words and special characters or their combinations. The set of characters to be stored must be put within double quotes (" ").
For example: A$ = "Hello".

Question 5

Alphanumeric constants

Answer

Any set of characters enclosed within double quotes (" ") can be called an alphanumeric constant. They do not change their value at the time of execution of the program.
For example: "Rishi", "April 4".

Question 6

Numeric constants

Answer

Numeric constants are the constants comprising of the digits. They may be accompanied by a negative sign or a decimal point. These constants are used for all kinds of mathematical operations.
For example: 56, -43, 7.43, -5.32 etc.

Give two differences between

Question 1

Numeric constants and Alphanumeric constants

Answer

Numeric constantsAlphanumeric constants
Numeric constants comprise of digits.Alphanumeric constants comprise of a set of characters.
Numeric constants are not enclosed in double quotes.Alphanumeric constants are enclosed in double quotes.

Question 2

Numeric variables and Alphanumeric variables

Answer

Numeric variablesAlphanumeric variables
Numeric variables store numeric values.Alphanumeric variables store alphabets, words, special characters or their combinations.
These variables are used for mathematical operations.Mathematical operations are not possible.
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