Continuation from "More on understanding basic language
SOME SYSTEM COMMANDS
1. REM: REM is a short form of Remark; It
is used to give heading for the program. It is a non-executable command. REM
command can be given anywhere in the program.
SYNTAX
LineNo
REM Comment
E.g.
10
REM This is a program for print 2 numbers
20
PRINT 5, 6
30
REM Now we can add the numbers
40
PRINT 5 + 6
50
END
RUN
OUTPUT
5 6
11
OK
2. CLS: CLS is a command used for clearing
the screen. This command wipes out whatever is displayed on the monitor.
SYNTAX
CLS
E.g.
10
PRINT 4
20
PRINT 8
30
PRINT “JOHN”
40
END
RUN
OUTPUT
4
8
JOHN
OK
CLS
After
CLS Command, the screen becomes clear of all data.
3.
RUN: RUN Command tells your computer
to read the program instructions and execute them. To execute RUN command,
press the function key F2.
SYNTAX
RUN
E.g.
10
PRINT “LET”
20
PRINT “US”
30
PRINT “GO”
40
END
RUN
OK
OUTPUT
LET
US
GO
4. LIST: LIST command lists out all the
instructions stored in the computer’s memory. It arranges a program in the
ascending order and displays all the instructions. To execute RUN command,
press the function key F1.
SYNTAX
LIST
LineNo
E.g.
10
PRINT “WILLIAM”
20
PRINT “BERNAD”
15
PRINT “SHAKESPEARE”
25
PRINT “SHAW”
LIST
OUTPUT
10
PRINT “WILLIAM”
15
PRINT “SHAKESPEARE”
20
PRINT “BERNAD”
25
PRINT “SHAW”
5.
NEW à New command wipes the old program from the
computer’s memory. It is food practice to type NEW and press ENTER key before
starting a NEW program.
SYNTAX
NEW
6. DELETE: As the name indicates, this
command is used to remove any unwanted line from your program.
SYNTAX
DELETE
E.g.
10
PRINT 5
20
PRINT 3
30
PRINT 10
40
END
One
line can be removed by typing DELETE 20.
Line
no 20 will be removed from the memory.
Now
LIST command should be used to view the program
10
PRINT 5
30
PRINT 10
40
END
POINTS
TO REMEMBER
1. REM or REMARK
statement is used as the heading of the title of the program
2. CLS command
is used to clear the screen.
3. NEW command
clears the program form the memory of the computer.
4. DELETE
command is used to remove any line from the program.
5.
RUN command executes the program.
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