Julia: Integers

Julia support following integer types.

Type	Number of Bits	Minimum value	Maximum value
Int8	8	-128	127
UInt8	8	0	255
Int16	16	-32768	32767
UInt16	16	0	65535
Int32	32	-2147483648	2147483647
UInt32	32	0	4294967295
Int64	64	-2^63	2^63 - 1
UInt64	64	0	2^64 - 1
Int128	128	-2^127	2^127 - 1
UInt128	128	0	2^128 - 1
Bool	8	false(0)	true(1), Any non zero value considered as true.

All the integer types that prefixed with ‘U’ are unsigned (Only positive) numbers.

What is the default type for integers?

It depends on target system architecture (32 bit (or) 64 bit).

# 32-bit system:
julia> typeof(100)
Int32

# 64-bit system:
julia> typeof(100)
Int64

How to know whether target system is 32-bit (or) 64-bit?
Julia provides a built-in constant 'WORD_SIZE', it returns the standard word size on the current machine, in bits.

julia> WORD_SIZE
64

What are the types Int, UInt?

In addition to the types mentioned in table, Julia provides two more types that are just aliases to system default integer and unsigned integer types.

#On 64-bit machine
julia> Int
Int64

julia> UInt
UInt64

#On 32 bit machine
julia> Int
Int32

julia> UInt
UInt32

Define integers in hexadecimal notation

By prefixing a number with 0x, you can define hexadecimal integers.

julia> a=0x12
0x12

julia> a
0x12

julia> dec(a)
"18"

Define integers in binary notation

By prefixing a number with 0b, you can define binary integers.

julia> 0b1010
0x0a

julia> dec(0b1010)
"10"

Define integers in octal notation
By prefixing a number with 0o, you can define binary integers.

julia> 0o10
0x08

julia> dec(0o10)
"8"

julia> dec(0o14)
"12"

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