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Type

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QB64 uses more variable types than Qbasic ever did. The variable type determines the size of values that numerical variables can hold.


Numerical types
 Type Name Type suffix symbol Minimum value Maximum value Size in Bytes
_BIT ` -1 0 1/8
_BIT * n `n -128 127 n/8
_UNSIGNED _BIT ~` 0 1 1/8
_BYTE  %% -128 127 1
_UNSIGNED _BYTE ~%% 0 255 1
INTEGER  % -32,768 32,767 2
_UNSIGNED INTEGER ~% 0 65,535 2
LONG & -2,147,483,648 2,147,483,647 4
_UNSIGNED LONG ~& 0 4,294,967,295 4
_INTEGER64 && -9,223,372,036,854,775,808 9,223,372,036,854,775,807 8
_UNSIGNED _INTEGER64 ~&& 0 18,446,744,073,709,551,615 8
SINGLE  ! or none -2.802597E-45 +3.402823E+38 4
DOUBLE # -4.490656458412465E-324 +1.797693134862310E+308 8
_FLOAT ## -1.18E−4932 +1.18E+4932 32(10 used)
_OFFSET  %& -9,223,372,036,854,775,808 9,223,372,036,854,775,807 Use LEN
_UNSIGNED _OFFSET ~%& 0 18,446,744,073,709,551,615 Use LEN
_MEM none combined memory variable type N/A Use LEN
 
Note: For the floating-point numeric types SINGLE (default when not assigned), DOUBLE and _FLOAT, the minimum values represent the smallest values closest to zero, while the maximum values represent the largest values closest to ±infinity. OFFSET dot values are used as a part of the _MEM variable type in QB64 to return or set the position in memory.


String text type
      Type Name       Type suffix symbol Minimum length Maximum length Size in Bytes
STRING $            0               2,147,483,647 Use LEN
STRING * n $n         1       2,147,483,647 n


Note: For the fixed-length string type STRING * n, where n is an integer length value from 1 (one) to 2,147,483,647.


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