BASIC - Programming Language

BASIC: THE FEELING OF THE GOOD OLD TIMES !
10 INPUT A
20 B = SIN(A)
30 PRINT "ANSWER: ", B
40 END

BASIC USER'S GUIDE:

• PRINT

10 PRINT "HELLO WORLD !"
20 END


• INPUT

10 INPUT “A=”, A
20 PRINT A
30 END


• IF...THEN...

Number Comparison:

10 INPUT A
20 IF A＞90 THEN B=“A”
30 PRINT B
40 END

Conditional Operators:
＞ greater than
＜ less than
＞= greater than or equal to
=＞ equal to or greater than
＜= less than or equal to
=＜ equal to or less than
= equal to
== equal to
＜＞ not equal to
!= not equal to

THEN can be followed by GOTO, GOSUB, INPUT, PRINT.

String Comparison:

10 INPUT A
20 IF A=“TOM” THEN PRINT “BOY”
30 END

Conditional Operators:

= is
== is
＜＞ is not
!= is not


• FOR...NEXT...

10 FOR I=1 TO 4 STEP 2
20 PRINT “HELLO”, I
30 NEXT I
40 END

STEP specifies the counter increment for each loop. If STEP doesn’t exit, the default increment is 1.

FOR...NEXT... loop can be nested.

10 FOR I=1 TO 5
20 FOR J=1 TO 4
30 PRINT I, J
40 NEXT J
50 NEXT I
60 END


• GOTO

10 ...
20 ...
30 ...
40 GOTO 10
50 ...


• GOSUB

10 PRINT “H”
20 GOSUB 100
30 PRINT “L”
40 END
100 PRINT “A”
110 RETURN


• SOUND

10 SOUND C, M, 0.5

The line 10 plays Middle C piano note for 0.5 seconds.

Note: C, C#, D, D#, E, F, F#, G, G#, A, A#, B
Pitch Range: L (low), M (middle), H (high)
Lasting Time: specifies how long a note lasts.

C, D, E, F, G, A, B can also be labeled as 1, 2, 3, 4, 5, 6, 7. (C# as 1#).


• TEXT

10 TEXT “HELLO”, x, y, size

(x,y): position of the string “HELLO”.


• CIRCLE

10 CIRCLE x, y, radius

(x,y): the center of the circle.


• RECTANGLE

10 RECT x, y, width, height

(x,y): top-left point of the rectangle.


• LINE

10 LINE x1, y1, x2, y2