DESCRIPTIVE TYPE QUESTIONS :
1. What is the use of INPUT statement ?
Ans. INPUT statement is used to enter the values ( text or number ) while the program is being executed. This command waits for the user to enter the information and then assigns the values accordingly .
For Eg : INPUT A
INPUT “ ENTER A NUMBER “ ; A
2. What is the difference between IF…THEN and IF…THEN…ELSE statements ?
Ans. IF…THEN is a conditional decision making statement that does a task specified after THEN if the condition is TRUE otherwise goes to the NEXT LINE in the program.
For Eg: IF A>100 THEN GOTO 60
IF…THEN…ELSE is a conditional decision making statement that does a task specified after THEN if the condition is TRUE otherwise do another task specified after ELSE.
For Eg: IF A>100 THEN GOTO 40 ELSE GOTO 60
3. What do you understand by the term Screen modes ?
Ans. Screen mode refers to the screen resolution in QBasic Output window. The default screen mode is Screen 0 . It displays only text. It is not used for Graphics. To use Graphics we can use other screen modes like Screen 7 , Screen 9 , Screen 12 and Screen 13.
4. How can we draw a rectangle ? Explain with an example.
Ans. The LINE statement is used to draw a rectangle .
The option B with LINE statement is used to draw a Rectangular Box without any fill .
For Eg : LINE ( 60 , 60 ) – ( 130 , 100 ) , 6 , B
The option BF with LINE statement is used to draw a Rectangular Box filled with a colour.
For Eg : LINE ( 60 , 60 ) – ( 130 , 100 ) , 6 , BF
Here , ( 60 , 60 ) and ( 130 , 100 ) indicates the co-ordinates of the top-left corner and bottom-right corner of the rectangle respectively and 6 indicates the colour.
5. What is the use of PSET statement ?
Ans. PSET statement is used to set a fixed point on the screen from where we can start a drawing .
For Eg : PSET ( 80 , 80 ) sets the point at (80 ,80) before starting a drawing.
Computer Notes 2019-20 