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

(x1,y1): the starting point of the line.

(x2,y2): the ending point of the line.

• POINT

10 POINT x, y

(x,y): the position of the point.

• CLR: clear the edit window.

• CLS: clear the graph window.

• DELAY

10 DELAY 0.5

0.5:lasting time in seconds

This function is used to suspend execution of a program for a particular time.

• CURVE

10 CURVE x, y, radius, 0, PI

0: starting angle

PI: ending angle

The curve draws clockwise with center (x,y).

• Mathematical Functions:

SIN(X), COS(X), TAN(X), COT(X),

ASIN(X), ACOS(X), ATAN(X),

SINH(X), COSH(X), TANH(X),

ASINH(X), ACOSH(X), ATANH(X).

SQR(X): square root of x.

ABS(X): absolute value of x.

FCT(X): x factorial.

LOG(X): natural logarithm of x.

LOG10(X): base-10 logarithm of x.

LOG2(X) :base-2 logarithm of x.

EXP(X): base-e exponential of x.

ERF(X): the error function of x.

ERFC(X): the complementary error function of x.

ROUND(X) :integral nearest to x.

CEIL(X): the smallest integral that is not less than x.

FLOOR(X): the largest integral that is not greater than x.

TGAMMA(X): the gamma function of x.

LGAMMA(X): the natural logarithm of the absolute value of the gamma function of x.

• Reserved Variables:

INKEY : once a key is pressed, the value of INKEY changes.

RND : a random number.

PI : π

• Some Tips:

1. Undo & Redo typing on iPhone with a shake.

2. Copy an Emoji or some character from other places (like Notes), then paste them on the edit window.

3. Exponentiation is expressed as X^Y.