Integer Types¶
Felix supports several families of integer types.
Integers Types¶
Platform variant integer types are based on C integer types whose sizes vary from platform to platform. In the tables below, the suffix is appended to a plain integer literal as a type modifier. The suffix letters can be in any order and can be upper or lower case.
ISO C Signed Integer Types¶
The size in bytes on Windows 32 and 64 bit platforms and Unix 32 and 64 bit platfoms is indicated.
| Felix | C | Suffix | W32 | W64 | U32 | U64 |
|---|---|---|---|---|---|---|
| tiny | signed char | t | 1 | 1 | 1 | 1 |
| short | short | s | 2 | 2 | 2 | 2 |
| int | int | 2 | 2 | 4 | 4 | |
| long | long | l | 4 | 4 | 4 | 8 |
| vlong | long long | vl,lv | 8 | 8 | 8 | 8 |
Int type may also use i suffix.
ISO C Unsigned Integer Types¶
All unsigned integer types provide a range of values from 0 to \(256^n-1\) for some n. The size in bytes is the same as the corresponding signed type.
| Felix | C | Suffix |
|---|---|---|
| utiny | usigned char | ut |
| ushort | unsigned short | us |
| uint | unsigned int | u |
| ulong | unsigned long | ul |
| uvlong | unsigned long long | uvl,ulv |
ISO C and Posix Aliases¶
| Felix | C | Suffix |
|---|---|---|
| intmax | intmax_t | j |
| uintmax | uintmax_t | uj |
| ssize | ssize_t | z |
| size | size_t | uz |
| intptr | intptr_t | p |
| uintptr | uintptr_t | up |
| ptrdiff | ptrdiff_t | d |
| uptrdiff | uptrdiff_t | ud |
The intmax and uintmax types are 8 bytes on Windows and Unix platforms. The other types are all the same as the machine word size, either 4 or 8 bytes.
Exact Signed Integer Types¶
| Felix | C | Suffix |
|---|---|---|
| int8 | int8_t | i8 |
| int16 | int16_t | i16 |
| int32 | int32_t | i32 |
| int64 | int64_t | i64 |
Exact Unigned Integer Types¶
| Felix | C | Suffix |
|---|---|---|
| uint8 | uint8_t | u8 |
| uint16 | uint16_t | u16 |
| uint32 | uint32_t | u32 |
| uint64 | uint64_t | u64 |
Integer Literals¶
An integer literal consists of an optional radix indicator, a string of digits with possible embedded spacers, and an optional suffix.
Radices¶
Felix supports 4 radices.
| Radix | Prefix | Digits |
|---|---|---|
| Hex | 0x | 0123456789abcdefABCDEF |
| Decimal | 0d | 0123456789 |
| Octal | 0o | 01234567 |
| Binary | 0b | 01 |
If omitted decimal radix if used. Radix letter may be upper or lower case. Note, in Felix a leading zero digit does not imply octal radix as in C.
Spacers¶
Integers allow an underscore between digits, after the radix specifier if one is given, or before the suffix specifier, if one is given.
Operations¶
All Integers¶
All integer types support the following operations.
| Operation | Operator |
|---|---|
| Addition | infix + |
| Subtraction | infix - |
| Multiplication | infix * |
| Division | infix / |
| Remainder | infix % |
| Left Shift | infix << |
| Right Shift | infix >> |
Left and right shifts are defined as multiplication by positive or negative powers of 2, respectively.
Signed Integers Only¶
| Operation | Operator |
|---|---|
| Negation | prefix -, neg |
| Sign | sgn |
| Absolute Value | abs |
The sgn operator returns -1 for negative, 0 for zero, and 1 for positive.
Unsigned Integer Only¶
These operations are bitwise logic operations. They are not available for signed integers.
| Operation | Operator |
|---|---|
| ones complement | ~ |
| bitand | infix \& |
| bitor | infix \| |
| bitxor | infix \^ |