This document provides information and examples on using basic programming commands like INPUT, IF/THEN, ELSE in QBASIC. It explains how to get input from the user, compare values, and perform different actions based on conditional statements. It also includes 3 exercises for readers to practice these commands: 1) An IF/THEN program to check a condition, 2) An IF/THEN/ELSE program with multiple conditions, and 3) An IF/THEN/ELSE/END IF program that asks for user input and prints different outputs. The document was prepared by two students for their computer programming class and adviser.

1. COMPUTER
PROGRAMMI
GPREPARED BY:
PAGADUAN, JOANNE A.
VIJUNGCO, ARISA MAE D.
GRADE 9 SSC LAVOISIER
MR. ANGEL CORONA
COMPUTER PROGRAMMING ADVISER

2. RETRIEVING
KEYBOARD
INPUT FROM
THE USER

3. INPUT
commandOne way to receive input from the
keyboard is with the INPUT
command.
Allows the user to enter a string or a
number, then stored in a variable.

4. REMEMBER:
If the program is executed, the INPUT command
displays a question mark, and followed by a
blinking cursor.
TIP:
If you place a string and a semi- colon between
INPUT and the variable, the program will print the
string.
INPUT “Please enter some text:”;

5. The IF and THEN
command
It is used to compare an expression and the
perform some task based on that expression.
x=3
IF x=3 THEN PRINT “x equals to 3”
Since X does equal 3 in this case, the
program outputs:
X equals to 3

6. EXPRESSION
Signs< (less than)
> (greater than)
<> (does not equal)
<= (less than or equal)
>= (more than or equal)
NOTE:
Some signs that can be used instead of = (equal)
sign.

7. ELS
EIt helps the program to perform different action if the
statement is false.
x=8
If x= 7 THEN PRINT “YES” ELSE PRINT “NO”
Since X doesn’t equal to 8, the output is:
NO

8. END
IFIt helps you to have multiple
commands after the IF… THEN
statement.
They must start on the line after the IF
statement.
END IF should appear right after the list
of commands.

9. INPUT “Please enter a number”, x
IF x< 6 THEN
PRINT “YES”
ELSE
PRINT “NO”
END IF

10. Proceed to next slides for
exercises
Test your
skills!

11. OBJECTI
VES: TO ENHANCE SKILLS IN COMPUTER PROGRAMMING USING THE
WIDELY KNOWN AND ACCEPTED PROGRAMMING LANGUAGE,
QBASIC.
 TO EASILY GRASP THE BASICS OF COMPUTER PROGRAMMING
THROUGH THE USE OF QBASIC.
PROCED
URE: ANSWER THE FOLLOWING EXERCISES THROUGH THE USE OF
QBASIC.
 USE QBASIC FOR COMPUTER PROGRAMMING FOR THE EXERCISES
READIED/MADE BY THE PRESENTERS.

12. EXERCISE 1:
IF- THEN
PROGRAM
x=143
IF x = 143 THEN PRINT “I LOVE YOU”
PROGRAM
x=333
IF x = 123 THEN PRINT “BLACK”

13. EXERCISE 2: IF-
THEN ELSE
PROGRAM
x = 100
IF x=90 THEN PRINT “LOL” ELSE PRINT “ULOL”
IF x=143 THEN PRINT “HAH” ELSE PRINT “HUH”
IF x<10 THEN PRINT “OKAY” ELSE PRINT “LANG”
IF x>100 THEN PRINT “WHATEVER” ELSE PRINT “TSK”
IF x<> 99 THEN PRINT “MAGANDA” ELSE PRINT “PANGIT”

14. EXERCISE 3: IF- THEN-
ELSE- END IF
This is about choosing to do either one thing or another (simple
selection). This is a test in the use of the IF instruction. The If instructions
spans many lines and includes four (4) keywords, IF, THEN, ELSE, END IF.
Create a program that will ask you a number. It will then print
out the word KIND. If the number is greater than 50 or the word RUDE if it
is not.
NOTE*
Two (2) programs for both outputs.
Instructions:

15. EXERCIS
E 1
PROGRAM
:
OUTPU
T:
The output should be
[ I LOVE YOU ]
since the given data satisfied the condition

16. PROGRA
M: OUTPU
T:
The output should be just blank since the given data
did not satisfy the condition.

17. EXERCISE 2
PROGRAM:
OUTP
UT:

18. EXERCISE 3
PROGRAM:
OUTP
UT:

19. PRESENTED BY:
PAGADUAN,
JOANNE A.
VIJUNGCO, ARISA
MAE D.
PRESENTED TO:
MR. ANGEL
CORONA
VIJUNGCO, ARISA MAE D.
PAGADUAN, JOANNE A.

20. END