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QuickBasic

QBASIC - Operators
| Boolean |

   
Boolean operators

• Boolean operators perform bit manipulations, Boolean operations, or tests on multiple relations. They return a true (nonzero) or false (zero) value to be used in making a decision.
• If the expressions evaluate to 0 or -1, a Boolean operation returns 0 or -1 as the result. Because Boolean operators do bit-wise calculations, using values other than 0 for false and -1 for true may produce unexpected results.
• Boolean operations are performed after arithmetic and relational operations in order of precedence.
• Expressions are converted to integers or long integers before a Boolean operation is performed.

QBASIC - Data types

QBASIC - Variables

Variabel-værdiernes placering i hukommelsen kan findes med funktionerne
- VARSEG(var) - variablens segment
- VARPTR(var) - variablens offset
- SADD(string) - string offset

QBASIC - Metacommands

$DYNAMIC

Specifies that arrays declared in subsequent DIM statements are dynamic arrays.
Array storage is allocated dynamically while the program runs.

REM $DYNAMIC ' $DYNAMIC

$STATIC

Specifies that arrays declared in subsequent DIM statements are static arrays (unless they are declared in a non-static SUB or FUNCTION procedure).
Array storage is allocated when you start the program, and remains fixed.

REM $STATIC ' $STATIC

 

NB: DIM and REDIM usually provide a better way to specify whether arrays are dynamic or static.

Operators

AND		Conjunction
EQV		Equivalence
IMP		Implication
MOD		Modulus
NOT		Bit-wise complement
OR		Disjunction (inclusive "or")
XOR		Exclusive "or

Mathematical Operators

*  Multiplication symbol
-  Minus sign
/  Division symbol (slash)
=  Relational operator or assignment symbol
>  Greater than
+  Plus sign
.  Decimal point
<  Less than
\  Integer division symbol (backslash)
^  Exponentiation symbol (up arrow or caret) 

Data type suffix

%  Integer
&  Long-integer
!  Single-precision
#  Double-precision
$  String