# QB64.com

## QB64 is a modern extended BASIC programming language that retains QBasic/QuickBASIC 4.5 compatibility and compiles native binaries for Windows, Linux, and macOS.

INTEGER is a 2-byte number type definition that can hold whole numerical values.

## Syntax

DIM variable AS INTEGER

• Integers do not use decimal point values but will round those off to the nearest even whole number.
• QBasic integer values can range from -32768 to 32767 without an “overflow” error.
• For larger integer values use the LONG integer type.
• QB64 INTEGER values greater than 32767 become negative signed values instead of throwing an “overflow” error, as the top bit designates a negative value. See example 1 below.
• QB64 _UNSIGNED integers can range from 0 to 65535.
• QB64 _UNSIGNED _INTEGER64 values range from 0 to 18446744073709551615
• Many graphic programs require INTEGER arrays.
• Variable type suffix is % or ~% for _UNSIGNED. Suffix can also be placed after a literal or hexadecimal numerical value.
• LONG integers use the & suffix and _INTEGER64 use the && suffix.
• Values can be converted to 2 byte ASCII string values using MKI\$ and back with CVI.
• When a variable has not been defined or has no type suffix, the value defaults to SINGLE.
• Warning: QBasic keyword names cannot be used as numerical variable names with or without the type suffix.

## Example(s)

QBasic signed integers were limited from -32768 to 32767, but could not exceed 32767 or it would error:

``````
DO: _LIMIT 2000
i% = i% + 1
PRINT i%
LOOP UNTIL i% = 0

``````

Explanation: In QB64 the count will go to 32767, then count up from -32768 to 0 before repeating the process without error.

When a signed QB64 INTEGER value exceeds 32767, the value may become a negative value:

``````
i% = 38000
PRINT i%

``````
``````
-27536

``````

Explanation: Use an _UNSIGNED INTEGER or a ~% variable type suffix for only positive integer values up to 65535.

In QB64 _UNSIGNED INTEGER values greater than 65535 cycle over again from zero:

``````
i~% = 70000
PRINT i~%

``````
``````
4464

``````

Explanation: In QB64 an unsigned integer value of 65536 would be 0 with values increasing by the value minus 65536.