Base-16 literal
0x3f
- Base 16
- 6 bits
- = 63
0x3f is a hexadecimal literal equal to 63 in decimal. It needs 6 bits (1 bytes) of storage, and is 0x3F in hexadecimal and 111111 in binary.
In every base
Bit width & storage
Significant bits6
Bytes needed1
Fits in 8 bitsYes
Fits in 16 bitsYes
Fits in 32 bitsYes
Fits in 64 bitsYes
Padded to 8 bits00111111
Padded to 32 bits00000000000000000000000000111111
Read another way
Bitwise operations
NOT (32-bit)4,294,967,232
Shift left by 1126
Shift right by 131
Population count6the number of set bits
Lowest set bit1
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The same value
Also reads as
U+003F (unicode character)
- U+003F
- ?
- Other punctuation
U+003F is code point 63 (?), an other punctuation in the Basic Latin (ASCII) block of the Basic Multilingual Plane. It takes 1 byte in UTF-8 and 1 unit in UTF-16.
Identity
Code pointU+003F
Decimal63
Character?
General categoryOther punctuation
BlockBasic Latin (ASCII)
PlaneBasic Multilingual Planeplane 0
Official nameNot includedthe Unicode Character Database is not bundled; a stale copy would be worse than none
Encodings
UTF-83F1 byte
UTF-16003Fa single unit
UTF-320000003F
Binary111111
Bytes in UTF-8 vs UTF-161 vs 2UTF-16 is not always smaller, even for non-Latin text
Writing it in code
HTML numeric entity?
HTML hex entity?
CSS escape\003F
JavaScript\u003F
Python\u003F
Percent-encoded (URL)%3F
Things that catch people out
JavaScript string length1
Needs a surrogate pairNo
Safe in a URL unescapedNo
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