JSS2 Computer Studies Lesson Note on Simple BASIC Statements

The website has the complete lesson note for all the subjects in secondary school but this piece showcases the JSS2 Computer Studies Lesson Note on Simple BASIC Statements. You can use the website search button to filter out the subject of interest to you.

CLICK HERE to download the complete Document: DOWNLOAD HERE

Sub-Topic 4: Simple BASIC Statements

Structure of BASIC program

One instruction or statement per line
Each line must begin with a line number
Line numbers are unsigned positive integers
Line number should increase in steps of 10 to allow for insertion of extra lines during program modification.

Example 1: Write a BASIC program to find the average of three numbers.

Solution:

5 REM FIND AVERAGE

10 READ A, B, C

20 DATA 5, 10, 15

25 LET SUM=A+B+C

30 LET AVE=SUM/3

35 PRINT AVE

40 END

Example 2: Write a BASIC program to calculate the volume of a box.

Solution:

10 REM FIND THE VOLUME OF A BOX

20 READ L, B, H

30 DATA 3,5,10

40 LET VOLUME =L*B*H

50 PRINT VOLUME

60 END

Conditional Statements

These are statements in BASIC programming that are dependent on some certain conditions and criteria before they can be obeyed. Example is IF…THEN…ELSE

IF…THEN…

This is a conditional statement. If the condition is true, the statement following the “THEN” is executed.

Example

2 INPUT A

IF A > 500 THEN GOTO 50 ELSE GOTO 2

50 PRINT A

60 END

Sample program

10 REM PROGRAM TO PRINT NAME AND ADDRESS

20 LET A$=”Deeper Life High School”

30 LET B$=”Opete off DSC Express Way, Warri, Delta State”

40 PRINT A$