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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$
50 PRINT B$
60 END
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