Input/Output

CLEAR                                                                      Clears the screen.

PRINT "Mark & Edna Schack"                  puts Mark & Edna on the screen.

PRINT TAB (5,10)                                           tabs down 5 lines vertically and 10 spaces      horizontally.

PRINT "Mark";                                                     prints Mark Schack on the screen.
PRINT " Schack"                                               The ; suppresses the carriage return and line feed.

PRINT "Mark",                                                     prints Mark            Schack.  The , puts "Schack" in the next print field.
PRINT " Schack" 

INPUT A$                                                             program stops until the user types a word and presses RETURN.
                                                                                  A$ takes the value of the typed word.

GET KEY A                                                          A takes the value of the next character typed without pressing RETURN.

Branching, Conditional, and Program Control

GOTO 50                                                                  sends computer to do line 50.

IF answer$="a" THEN GOTO 500                  sends computer to line 500 if the string variable answer$ is equal to a.

IF X=6 THEN GOTO 500                                     sends computer to line 500 if the variable X is equal to 6.

IF X<6 THEN GOTO 500                                     sends computer to line 500 if the variable X is less than 6.

IF X<>6 THEN GOTO 500                                    sends computer to line 500 if the variable X is not equal to 6.

END                                                                          must be used in last line of program.

STOP                                                                        stops execution of program.  Any number of stop statements may be used.

Non Executable Remarks

REM                                                                         The computer will ignore this remark.  ! Does the same thing.

Counting, Looping, and Timing

FOR i=1 TO 50000                                                   counts to 50000.  Used for time delay.
NEXT i

FOR i=4 TO 1 STEP -1                                            counts down and prints 1,2,3,4 in a column.
PRINT i
NEXT i

Variables

LET x=5                                                                           variable x becomes equal to the numeric value 5.

LET name$="Mark Schack"                                            variable name$ becomes equal to the text string Mark Schack.
                                                                                            The $ suffix means a string (text) variable   rather than a numeric value.

LET answer$=CHR$(answer)                               string variable answer$ becomes equal to the character represented  by the numerical
                                                                                            value (ACSII) of the  variable answer.

Arithmetic Operations

+     -     *     /                                              add,  subtract, multiply, divide

PRINT x = 12/3                                                           prints quotient of 4

PRINT SQR(x)                                                              prints square root of x

PRINT 3^2                              prints 9 (3 squared)

RANDOMIZE                                                                     prints a random integer
PRINT INT(RND * 10)                                              between 1 and 9.
 
Graphics

SET WINDOW 0,100,0,100                                         formats graphic screen for 100 X 100 array

PLOT LINES:  30,10; 30,40                               draws line from x,y coordinate 30,10 to 30,40.

SET COLOR 12                                                                 changes color to one of 256 possible hues

 This glossary contains some of the most commonly used TrueBasic instructions, but it is not complete.  For more information click here.
 

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