BASIC Cheat Sheet

10 PRINT "Hello, World!"
20 END

10 REM Program starts here
20 PRINT "Line 20"
30 PRINT "Line 30"
40 END

10 REM This is a comment
20 PRINT "Code" REM Inline comment
30 END

10 LET X = 10
20 LET Y = 3.14
30 LET TOTAL = X + Y
40 PRINT TOTAL
50 END

10 LET NAME$ = "John Doe"
20 LET MESSAGE$ = "Hello, " + NAME$
30 PRINT MESSAGE$
40 END

10 DIM NUMBERS(10)
20 DIM NAMES$(5)
30 LET NUMBERS(1) = 100
40 LET NAMES$(1) = "Alice"
50 END

10 PRINT "Hello"
20 PRINT "Value:", 100
30 PRINT "A"; "B"; "C" REM No spaces
40 PRINT "X", "Y", "Z" REM Tab separated
50 END

10 INPUT "Enter your name: ", NAME$
20 INPUT "Enter your age: ", AGE
30 PRINT "Hello, "; NAME$
40 PRINT "You are "; AGE; " years old"
50 END

10 INPUT "Enter age: ", AGE
20 IF AGE >= 18 THEN PRINT "Adult"
30 IF AGE < 18 THEN PRINT "Minor"
40 END

10 INPUT "Enter age: ", AGE
20 IF AGE >= 18 THEN GOTO 50
30 PRINT "Minor"
40 GOTO 60
50 PRINT "Adult"
60 END

10 INPUT "Select (1-3): ", CHOICE
20 ON CHOICE GOTO 100, 200, 300
30 PRINT "Invalid choice"
40 GOTO 400
100 PRINT "Option 1"
110 GOTO 400
200 PRINT "Option 2"
210 GOTO 400
300 PRINT "Option 3"
400 END

10 FOR I = 1 TO 10
20 PRINT I
30 NEXT I
40 END

10 FOR I = 0 TO 100 STEP 10
20 PRINT I
30 NEXT I
40 END

10 LET I = 1
20 IF I > 10 THEN GOTO 60
30 PRINT I
40 LET I = I + 1
50 GOTO 20
60 END

10 FOR I = 1 TO 3
20 FOR J = 1 TO 3
30 PRINT I; ","; J
40 NEXT J
50 NEXT I
60 END

10 GOSUB 100
20 GOSUB 200
30 END
100 PRINT "Subroutine 1"
110 RETURN
200 PRINT "Subroutine 2"
210 RETURN

10 LET X = 10
20 LET Y = 20
30 GOSUB 100
40 PRINT "Result:", RESULT
50 END
100 REM Add subroutine
110 LET RESULT = X + Y
120 RETURN

10 LET TEXT$ = "Hello World"
20 LET L$ = LEFT$(TEXT$, 5)  REM "Hello"
30 LET R$ = RIGHT$(TEXT$, 5) REM "World"
40 LET M$ = MID$(TEXT$, 7, 5) REM "World"
50 END

10 LET TEXT$ = "Hello"
20 LET LENGTH = LEN(TEXT$)
30 PRINT "Length:", LENGTH REM 5
40 END

10 LET FIRST$ = "John"
20 LET LAST$ = "Doe"
30 LET FULL$ = FIRST$ + " " + LAST$
40 PRINT FULL$ REM "John Doe"
50 END

10 PRINT "10 + 5 =", 10 + 5
20 PRINT "10 - 5 =", 10 - 5
30 PRINT "10 * 5 =", 10 * 5
40 PRINT "10 / 5 =", 10 / 5
50 PRINT "10 ^ 2 =", 10 ^ 2 REM Power
60 END

10 PRINT "ABS(-10):", ABS(-10)
20 PRINT "SQR(16):", SQR(16) REM Square root
30 PRINT "INT(3.7):", INT(3.7)
40 PRINT "RND:", RND REM Random 0-1
50 END