QuickBasic

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QuickBASIC is a GW-Basic-like platform developed by Microsoft.

Contents 1 Hello World 2 Command Reference 2.1 Program Flow 2.2 Declarations 2.3 Device I/O 2.4 File I/O 2.5 String Functions 2.6 Graphics 2.7 Error Trapping 3 Data Types 4 References

[edit] Hello World

Here is a Hello World program written in QuickBASIC:

CLS
PRINT "Hello World"

As QuickBASIC programs run in a DOS environment, the CLS command is generally used as the first line to remove clutter from the output screen caused by previous runs. The PRINT command then simply displays its arguments on the screen.

[edit] Command Reference

The following commands used in QuickBASIC are organized by type.

[edit] Program Flow

• DO...LOOP
• IF...THEN
• FOR...NEXT
• GOSUB
• GOTO
• REPEAT...UNTIL
• SELECT...END SELECT
• WHILE...WEND

[edit] Declarations

• DECLARE
• SUB...END SUB
• FUNCTION...END FUNCTION

[edit] Device I/O

• PRINT
• PRINT USING
• LPRINT
• INPUT

[edit] File I/O

• OPEN
• WRITE #
• PRINT #
• GET
• PUT
• EOF

[edit] String Functions

• LEFT
• MID
• RIGHT
• LEN
• INSTR

[edit] Graphics

• SCREEN
• DRAW
• COLOR
• PALETTE
• PAINT

[edit] Error Trapping

• ON KEY GOSUB
• ON ERROR GOTO
• RESUME

[edit] Data Types

Data Type	Maximum Size	Symbol
INTEGER	-32,767 to 32,768	%
LONG	-2,147,483,648 to 2,147,483,647	&
SINGLE	+/-1.401298 * 10^-45 to +/-3.402823 * 10^38	!
DOUBLE	+/-4.940656 * 10^-324 to +/-1.7976931 * 10^308	#
STRING	32,767 characters	$

[edit] References

1. Wikipedia's QuickBASIC article.
2. QuickBASIC editor help.