ch-6 QBASIC

Ch-6
QBASIC
Short answer type questions:-
Q1. Write the purpose and syntax of the following statements:
a)      CLS         b) LET    c) INPUT               d) END
ANS1.
Statement
Syntax
Purpose
1.CLS
CLS
It clears the screen.



2.LET
LET<variable>=<constants>
To assign a value to a variable.



3.END
END
It ends the program permanently. It can be used only once at the end of the program.



4.INPUT
INPUT<variable>
To accept a value for the variable.
Q2. What is elseif? Explain.
Ans2. The command allows us to perform a secondary action if the first expression mentioned with the IF statement was false.
Syntax:- IF<condition1>then
                <Statements>
                Elseif<condition>
                <Statements>
Else
<Statements>
Endif.
Q3. What is the difference between LET and INPUT statements?
Ans3.
LET
INPUT
1.       Purpose:- to assign a value to the variable
Purpose: - to accept a value for the variable.
2.       Syntax:- LET<variable>=<constant>
Syntax:-INPUT <variable>
3.       Example:- LET A=10
Example:- INPUT A
Q4. Write a note on REM statement.
Ans4. The text after REM is taken as comments. It is known as non executable command and is simply ignored by the computer.
Syntax: - REM<remarks>
Long answer type questions:-
Q1. Which command allows us to perform secondary action if the first expression mentioned with the IF statement was false? Explain briefly.
Ans1. The command allows us to perform a secondary action if the first expression mentioned with the IF statement was false.
Syntax:- IF<condition1>then
                <Statements>
                Elseif<condition>
                <Statements>
Else
<Statements>
Endif.
If no condition is satisfied, the program control will go to the statement after the ELSE part.
Example:-
To print the grades:-
Cls
Input ”Enter marks”;MK
IF MK>=90 THEN
Grade$ = “A”
ELSEIF MK>=80 THEN
Grade$= “B”
ELSEIF MK>=70 THEN
Grade$= “C”
ELSE
Grade $=”D”
ENDIF
PRINT Grade$
END.






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