COMPUTER PROGRAMMING

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

RETRIEVING
KEYBOARD
INPUT FROM
THE USER

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.

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:”;

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

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.

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

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.

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

Proceed to next slides for
exercises
Test your
skills!

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.

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

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”

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:

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

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

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

COMPUTER PROGRAMMING

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