about QBASIC programming

1.      What is QBASIC programming language? Write its any two versions.

= Quick Beginner All Purpose Symbolic Instruction Code (QBASIC) is one of the easy and popular high level programming language developed by Microsoft Corporation USA. Its two versions are:  QBASIC 4.5 and QBASIC 6.4

2.      Write any four feature of QBASIC.

-          QBASIC is interpreter based language

-          QBASIC checks syntax automatically

-          QBASIC supports modular programming approach.

-          QBASIC is not case sensitive

3.      What are the difference between immediate window and view window?

Immediate	View
v  The lower windows which is  tiled as immediate is known as immediate window.	v  The upper window which is titled as 'Untitled' window  is known as view window
v  It is the window to test command expression etc	v  It is the window where we write program using QBASIC language.
v  To see the output of the statement  we need to press Enter key	v  To see the output of the statement we need to press F5 key

4

.      What is meant by running a program? Which key is used to run a program?

= Running ( Execution) is the process by which a computer carries out the result or output of the program.

We used F5 key to run a program.

Elements of QBASIC programming Language

1.      What are the basic elements required to develop the QBASIC program?

=The basic elements required to develop the QBASIC program are:

a.       Character Set         b. Keywords    c. Variables      d. Constants     e. operators      f. Expression

2.      What is keyword? Give some examples of QBASIC keywords.

= Keywords are the collection of commands, statements or functions which are used to perform specific task, also known as reserve words. Its examples are: INPUT, PRINT, CLS, LET, REM etc.

3.      What is a variable? What are the types of variables.

= A variable is a name of storage location in computer's memory, in which we can store different values. Its types are: a. Numeric Variable b. String Variable

4.      What is a string variable? Give some examples.

= A variable that store string data ( alphanumeric data) that cannot be used for calculation is known as string variable. For example:  A$, Ram$, Suman$

5.      Mention any four rules for naming a variable.

=Four rules for naming a variable are:

-          The variable name must begin with alphabets.

-          The variable name may be up to 40 character long.

-          The bank space is not allowed in between the variable  name.

-          Variable in QBASIC are not case sensitive

6.      What is a constant? Write its types.

=Constant are the fixed values or notion which remain unchanged during the program execution time. Its types are: a. Numeric constant                      b. String constant

7.      What is string operator? Write its example.

= The operator which is used to combine or join two or more string value is called string operator. For example:

string data (A$)	String data (B$)	Result (A$+B$)
"micro"	"soft"	Microsoft
"9845"	"4822"	98454822

8.      What is logical operator? Write truth table of AND operator.

=The operator which is used to combine two or more relational expression is called logical operators. Truth table of AND operator:-

Condition  (A)	Condition (B)	Result (A and B)
False	True	False
True	False	False
False	False	False
True	True	True

9.      List the types of numeric variable with their declaration symbol.

=Types of numeric variable with their declaration symbol are :

Types of Numeric Variable	Deceleration Symbol
Integer	%
Long Integer	&
Single Precision	!
Double Precision	#

QBASIC General Statements

1.      What is statement? List any four QBASIC statements.

=A command or set of instructions used in the program is called statement. Four QBASIC statements are:

a.       LET statement        b. INPUT statement     c. PRINT statement      d. REM statement

2.      What is the use of REM statement in the program? Is it compulsory statement?

=The REM is a declaration statement which is used to put comment or remark in the program. No it is not compulsory statement.

3.      What is the different between print with (;) and print with (,)?

=The semicolon (;) is used with print statement to leave a single space between the items where as comma (,) is used to leave 14 spaces (1 zone) between items.

4.      What is the use of Read….Data statement?

=  Read…..Data statement is used to read the given value of data statement and store them with suitable variable.

Control Statements In QBASIC

1.      What are control statements? Write two control statements.

= The statements which alter and transfer the control flow from one statement line to another line are called control statement. Two control statements are:   a. IF……….THEN    b.IF…….THEN……..ELSE

2.      What is looping? Write the use of looping statement in QBASIC.

=Looping also known as iteration is the process of repetition of some block of statements up to fixed number of times. Looping statement are used in QBASIC to executed a block of statements several times based on the specified condition.

3.      What are start value and stop value of counter variable.

=Start value of counter variable is the initial value of the counter and Stop value is the value that the loop counter must pass to exit the loop; it marks the condition when the loop should end.

4.      List any three looping statements.

\=Three looping statements are:  a. FOR….NEXT         b. WHILE……WEND             c. DO…..LOOP

5.      What is the difference between  IF…..THEN and IF…THEN….ELSE statement?

= The IF…THEN statement is the most simple form of the control statements which executed a block of statements only if the specified expression is true where as IF…THEN…ELSE statement is used to executed the multiple statements depending on the condition.( When the condition is true, then the statement after then will be executed and when the condition is false, the statements in the else block will be executed.)

Program written by using control statements

a.       To print the name of your school for five times.

CLS

A$= "IRIS ENGLISH ACADEMY"

FOR I= 1 TO 5

PRINT A$

NEXT I

END

b.      To print two different numbers and check which one is smaller?

CLS

INPUT "Enter first number"; A

INPUT "Enter second number"; B

IF A< B THEN

PRINT "first number is smaller than second"

END IF

IF B< A THEN
PRINT "second number is smaller than first"

END IF
END

c.       To print the following numeric series.

i.                    2          4          8          16        32        64        upto 10^th term.

CLS
A=2

FOR I=1 TO 10

PRINT A

A=A*2

NEXT I

END

ii.                  3          33        333      3333    33333

CLS

A=3

FOR I= 1TO 5

PRINT A

A= A*10+3

NEXT I

END

iii.                5          55        555      5555   

CLS
A=5

FOR I=1 TO 4

PRINT A

A=A*10+5

NEXT I

END

iv.                To display the first 10 integers for 1 to 10

 CLS

FOR I= 1TO 10

PRINT I
NEXT I
END

v.                   To display the Odd number from 1 to 10

CLS

FOR I= 1TO10 STEP 2

PRINT I

NEXT I

END

vi.                to display the series : 25          20        15        10        5

 CLS

FOR I= 25 TO 5 STEP -5

PRINT I

NEXT I

END

vii.              To display the series: 4            16        35        64        100

CLS

FOR I=2 TO 10 STEP 2

PRINT I^2

NEXT I

END

viii.            To display the multiplication table of an input number.

CLS

INPUT "Enter the number"; N
FOR I= 1 TO 10

PRINT N; "x";I; "="; I*N

NEXT I

END

QBASIC programming by using general QBASIC Statement

a.       To calculate and display the total price of 20 pencils if a pencil costs Rs 3.

CLS
LET P=3                                         p= price of single pencil

LET TP= P*20                               TP= Total pencil price

PRINT "price of total Pencil";TP

END

b.      To enter radius of a circle; then calculate and display its circumference.

CLS
INPUT "Radius of circle"; R

LET C=2*22/7*R

PRINT "circumference"; C
END

c.       To enter length and breadth of a room. Calculate and display its perimeter [P= 2(L+B)]

CLS
INPUT "Length of room"; L

INPUT "Breadth of room"; B

LET P= 2*(L+B)

PRINT "perimeter of room"; P

END

d.      To input length in centimeter and calculate its length in meter

CLS
INPUT " length in centimeter"; CM

LET M=CM/100

PRINT "length in meter"; M

END

e.       To input temperature in Celsius and calculate its temperature in Fahrenheit.  [ F=9/5*(c+32)]

CLS

INPUT "temperature in Celsius"; C

LET F=9/5*(c+32)

PRINT "temperature in Fahrenheit"; F

END

f.       to input temperature in Fahrenheit and calculate its temperature in Celsius . [ c=5/9*(f-32)]

CLS

INPUT "temperature in Fahrenheit", F

LET C=5/9*(F-32)

PRINT "temperature in Celsius"; C

END

g.       A program that asks you to input money in nepali currency and convert its value in dollar. [1$=90RS]

CLS
INPUT "nepali currency"; NC

LET D= NC/90

PRINT "dollar"; D

END

h.      A program that asks you to input a number ;  that calculate the square and square  root of that number.

CLS

INPUT "number";N
LET S=N^2

LET SR=N^(1/2)

PRINT "square"; S
PRINT "square root";SR

END

i. A program to find out simple interest

CLS
INPUT "Principal"; P

INPUT "Rate";R

INPUT "Time";T

LET SI=P*T*R/100

PRINT "Simple Interest"; SI

END