Computer Studies - Junior Secondary 2

Term: 2^nd Term

Week: 6

Class: Junior Secondary School 2

Age: 13 years

Duration: 40 minutes of 2 periods each

Date:

Subject: Computer studies

Topic:- BASIC

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

List and explain the key BASIC statements

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION	TEACHER’S ACTIVITY	STUDENT’S ACTIVITY
STEP 1 INTRODUCTION	The teacher revises the previous lesson on BASIC	Students pay attention
STEP 2 EXPLANATION	She lists the key BASIC statements	Students pay attention and participates
STEP 3 DEMONSTRATION	She explains the key BASIC statements	Students pay attention and participate
STEP 4 NOTE TAKING	The teacher writes a summarized note on the board	The students copy the note in their books

NOTE

BASIC

Remark Statement (REM):This is a remark. It does not affect the program in terms of instruction or command line.

a. REM: It is used in explaining what the program is all about. Example, 10 REM. Program to calculate average of numbers. This statement will appear as comment on the screen

2. Assignment Statement: This keyword is used in assigning values to variables, e.g. READ, DATA, LET, INPUT

A. READ statement: This is a statement used in giving values to variables. Usually READ statement has DATA statement with it.

Examples,

I 10 READ I,M,N

20 DATA 5,7,9

II 10 READ A,B,C

20 DATA 1,2,3

B. DATA statement:This statement is used in attaching strings of fixed characters and numeric data in BASIC. A DATA statement can have one piece of data or many. Either of these is called DATA element.

DATA elements are separated by commas (,).

Examples,

I 10 READ A,B,C,D

20 DATA 6,7,15,10

30 PRINT “SUM” = A+B+C+D

40 RUN

SUM =38

II 10 REM PROGRAM TO SUM NUMBERS

20 READ X,Y,Z

30 DATA 15,10,20

40 PRINT “SUM” = X+Y+Z

SUM = 45

C. LET statement:This statement is used in attaching strings of fixed characters and numeric data in BASIC.

Examples,

I 5 LET A = 50

10 LET B = 10

15 LET C = A + B

Here the lines are 5, 10, 15

II 10 READ A, B,C,D

20 DATA 6,7,15,10

30 LET SUM = A +B + C + D

RUN

SUM = 38

D. INPUT statement: This statement is used assigning values to variables.

Examples,

I) 10 INPUT A

20 INPUT B

30 INPUT C

40 PRINT A, B, C

Program Terminator

These keywords are used to terminate the program, e.g. STOP AND END

a) STOP statement: This statement is used to terminate a program.

b) END statement: This statement is used to terminate a program.

Example,

10 REM

20 GOTO 50 (The program moves to line 50)

30 READ A, B ,C, D

40 PRINT “SUM” = A+B+C+D

50 STOP

Output Statement.

This keyword is reversed to display output from the computer, e.g. PRINT

a) PRINT statement: This statement is used to transmit or display output data from the computer. The PRINT statement is usually followed by a list of items to be displayed and each item is separated by a comma (,) or semi-colon (;)

Examples are:

I) 10 PRINT A, B, C

20 PRINT “X” =; “Y” = Y

This statement will cause the monitor to display whatever is stored in the non-numeric variables ABC and whatever is stored in X and Y.

II) PRINT (2*4)/2

The monitor will display 60

III) 5 LET A = 50

10 LET B = 10

15 LET C = A + B

20 PRINT C

The monitor will display 60

EVALUATION: 1. List and explain three key BASIC statements

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively

Computer Studies - Junior Secondary 2 - BASIC