Review of Qbasic

 Constant is a value in the computer memory which doesn't change

 variable is a value in the computer memory which change

types of variable

numeric variable : we store number

string variable: we store names, text , address

Operator is sign which perform certain operations

operation be

• mathematical(+,-,*,/)
• logical(AND, OR, NOT)
• string(+)
• Relational Operator(<,>,=,<=,>=,<>(not equals to))

statements

CLS

REM

INPUT

PRINT

END

Syntax: the rule or the way in which program is written

IF ..... ELSE IF...... END

Syntax

IF <condition1>

 print "this statement will be executed if condition1 is true"

ELSE IF <Condition2>

print "this statement will be executed if condition2 is true"

ELSE 

PRINT "this line will be printed"

END IF

WRITE THE SYNTAX OF FOLLOWING STATEMENTS with one example

i) FOR … NEXT statement 

ii) DO … LOOP statement 

iii) WHILE … WEND statement

Program #1 Program to display first 100 natural numbers: 

REM To display first 100 natural numbers 

CLS 

FOR i = 1 TO 100 

 PRINT i; 

NEXT i 

END

Program #2 Program to display the multiplication table of any supplied number: 

REM To display the multiple tables of any supplied number 

CLS 

INPUT "Type any number "; n

c = 1 

DO 

PRINT n; "x"; c; "="; n * c 

 c = c + 1 

LOOP WHILE c <= 10 

END

C	Output print “N x c”= N*c
1	3x1=3
2	3x2=6
3	3x3=9
4	3x4=12
5	3x5=15
6	3x6=18
7	3x7=21
8	3x8=24
9	3x9=27
10	3x10=30

output

Type any number:3

3x1=3

3x2=6

3x3=9

3x4=12

3x5=15

3x6=18

3x7=21

3x8=24

3x9=27

3x10=30

Program #3 Program to check prime or composite 

REM TO check prime or composite 

CLS 

INPUT "Type any number "; n 

FOR i = 2 TO n - 1 

 IF n MOD i = 0 THEN  c = c + 1 

NEXT i 

IF c = 0 THEN 

 PRINT "Prime" 

ELSE PRINT "Composite" 

END IF 

END

N=5

C=0

N	i	C=c+1
5	2	0
5	3	0
5	4	0

 output

type any number :5

Prime

Program to check Armstrong or not: 

REM To check Armstrong or not 

CLS 

INPUT "Type any number "; n 

a = n 

WHILE n < > 0 

 r = n MOD 10 

 s = s + r ^ 3 

 n = n \ 10 

WEND 

IF a = s
THEN 

PRINT "Armstrong" ELSE 

PRINT "Not Armstrong" 

END IF 

END

Library Functions /Inbuild function

a) LEN ()             b) LEFT$ ()         c) RIGHT$ () 

d) MID$ ()           e) LCASE$ ()     f) UCASE$ () 

g) VAL ()             h) STR$ ()         i) ASC() 

j) CHR$()             i) SQR ()            j) FIX() 

k) INT()                 l) LTRIM$ ()