Static Public Member Functions |
static Integer | decode (const std::string &value) |
| Decodes a String into a Integer.
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static int | reverseBytes (int value) |
| Returns the value obtained by reversing the order of the bytes in the two's complement representation of the specified int value.
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static int | reverse (int value) |
| Returns the value obtained by reversing the order of the bits in the two's complement binary representation of the specified int value.
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static int | parseInt (const std::string &s, int radix) |
| Parses the string argument as a signed int in the radix specified by the second argument.
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static int | parseInt (const std::string &s) |
| Parses the string argument as a signed decimal int.
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static Integer | valueOf (int value) |
| Returns a Integer instance representing the specified int value.
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static Integer | valueOf (const std::string &value) |
| Returns a Integer object holding the value given by the specified std::string.
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static Integer | valueOf (const std::string &value, int radix) |
| Returns a Integer object holding the value extracted from the specified std::string when parsed with the radix given by the second argument.
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static int | bitCount (int value) |
| Returns the number of one-bits in the two's complement binary representation of the specified int value.
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static std::string | toString (int value) |
| Converts the int to a String representation.
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static std::string | toString (int value, int radix) |
| Returns a string representation of the first argument in the radix specified by the second argument.
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static std::string | toHexString (int value) |
| Returns a string representation of the integer argument as an unsigned integer in base 16.
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static std::string | toOctalString (int value) |
| Returns a string representation of the integer argument as an unsigned integer in base 8.
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static std::string | toBinaryString (int value) |
| Returns a string representation of the integer argument as an unsigned integer in base 2.
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static int | highestOneBit (int value) |
| Returns an int value with at most a single one-bit, in the position of the highest-order ("leftmost") one-bit in the specified int value.
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static int | lowestOneBit (int value) |
| Returns an int value with at most a single one-bit, in the position of the lowest-order ("rightmost") one-bit in the specified int value.
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static int | numberOfLeadingZeros (int value) |
| Returns the number of zero bits preceding the highest-order ("leftmost") one-bit in the two's complement binary representation of the specified int value.
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static int | numberOfTrailingZeros (int value) |
| Returns the number of zero bits following the lowest-order ("rightmost") one-bit in the two's complement binary representation of the specified int value.
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static int | rotateLeft (int value, int distance) |
| Returns the value obtained by rotating the two's complement binary representation of the specified int value left by the specified number of bits.
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static int | rotateRight (int value, int distance) |
| Returns the value obtained by rotating the two's complement binary representation of the specified int value right by the specified number of bits.
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static int | signum (int value) |
| Returns the signum function of the specified int value.
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static Integer decaf::lang::Integer::decode |
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const std::string & |
value | ) |
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Decodes a String into a Integer.
Accepts decimal, hexadecimal, and octal numbers given by the following grammar:
The sequence of characters following an (optional) negative sign and/or radix specifier ("0x", "0X", "#", or leading zero) is parsed as by the Integer.parseInteger method with the indicated radix (10, 16, or 8). This sequence of characters must represent a positive value or a NumberFormatException will be thrown. The result is negated if first character of the specified String is the minus sign. No whitespace characters are permitted in the string.
- Parameters
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value | - The string to decode |
- Returns
- a Integer object containing the decoded value
- Exceptions
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NumberFomatException | if the string is not formatted correctly. |
static int decaf::lang::Integer::numberOfLeadingZeros |
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int |
value | ) |
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Returns the number of zero bits preceding the highest-order ("leftmost") one-bit in the two's complement binary representation of the specified int value.
Returns 32 if the specified value has no one-bits in its two's complement representation, in other words if it is equal to zero.
Note that this method is closely related to the logarithm base 2. For all positive int values x:
* floor( log2(x)) = 31 - numberOfLeadingZeros(x)
* ceil( log2(x)) = 32 - numberOfLeadingZeros(x - 1)
- Parameters
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value | - the int to be inspected |
- Returns
- the number of zero bits preceding the highest-order ("leftmost") one-bit in the two's complement binary representation of the specified int value, or 32 if the value is equal to zero.
static int decaf::lang::Integer::parseInt |
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const std::string & |
s, |
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int |
radix |
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Parses the string argument as a signed int in the radix specified by the second argument.
The characters in the string must all be digits, of the specified radix (as determined by whether Character.digit(char, int) returns a nonnegative value) except that the first character may be an ASCII minus sign '-' to indicate a negative value. The resulting byte value is returned.
An exception of type NumberFormatException is thrown if any of the following situations occurs:
- The first argument is null or is a string of length zero.
- The radix is either smaller than Character.MIN_RADIX or larger than Character.MAX_RADIX.
- Any character of the string is not a digit of the specified radix, except that the first character may be a minus sign '-' provided that the string is longer than length 1.
- The value represented by the string is not a value of type int.
- Parameters
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s | - the String containing the int representation to be parsed |
radix | - the radix to be used while parsing s |
- Returns
- the int represented by the string argument in the specified radix.
- Exceptions
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NumberFormatException | - If String does not contain a parsable int. |
static int decaf::lang::Integer::parseInt |
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const std::string & |
s | ) |
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Parses the string argument as a signed decimal int.
The characters in the string must all be decimal digits, except that the first character may be an ASCII minus sign '-' to indicate a negative value. The resulting int value is returned, exactly as if the argument and the radix 10 were given as arguments to the parseInteger( const std::string, int ) method.
- Parameters
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- Returns
- the converted int value
- Exceptions
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NumberFormatException | if the string is not a int. |
static int decaf::lang::Integer::rotateLeft |
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int |
value, |
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int |
distance |
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Returns the value obtained by rotating the two's complement binary representation of the specified int value left by the specified number of bits.
(Bits shifted out of the left hand, or high-order, side reenter on the right, or low-order.)
Note that left rotation with a negative distance is equivalent to right rotation: rotateLeft(val, -distance) == rotateRight(val, distance). Note also that rotation by any multiple of 32 is a no-op, so all but the last five bits of the rotation distance can be ignored, even if the distance is negative: rotateLeft(val, distance) == rotateLeft(val, distance & 0x1F).
- Parameters
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value | - the int to be inspected |
distance | - the number of bits to rotate |
- Returns
- the value obtained by rotating the two's complement binary representation of the specified int value left by the specified number of bits.
static int decaf::lang::Integer::rotateRight |
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int |
value, |
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int |
distance |
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Returns the value obtained by rotating the two's complement binary representation of the specified int value right by the specified number of bits.
(Bits shifted out of the right hand, or low-order, side reenter on the left, or high-order.)
Note that right rotation with a negative distance is equivalent to left rotation: rotateRight(val, -distance) == rotateLeft(val, distance). Note also that rotation by any multiple of 32 is a no-op, so all but the last five bits of the rotation distance can be ignored, even if the distance is negative: rotateRight(val, distance) == rotateRight(val, distance & 0x1F).
- Parameters
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value | - the int to be inspected |
distance | - the number of bits to rotate |
- Returns
- the value obtained by rotating the two's complement binary representation of the specified int value right by the specified number of bits.
static std::string decaf::lang::Integer::toBinaryString |
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int |
value | ) |
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Returns a string representation of the integer argument as an unsigned integer in base 2.
The unsigned integer value is the argument plus 2^32 if the argument is negative; otherwise it is equal to the argument. This value is converted to a string of ASCII digits in binary (base 2) with no extra leading 0s. If the unsigned magnitude is zero, it is represented by a single zero character '0'; otherwise, the first character of the representation of the unsigned magnitude will not be the zero character.
The characters '0' and '1' are used as binary digits.
- Parameters
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value | - the int to be translated to a binary string |
- Returns
- the unsigned int value as a binary string
static std::string decaf::lang::Integer::toHexString |
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int |
value | ) |
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Returns a string representation of the integer argument as an unsigned integer in base 16.
The unsigned integer value is the argument plus 2^32 if the argument is negative; otherwise, it is equal to the argument. This value is converted to a string of ASCII digits in hexadecimal (base 16) with no extra leading 0s. If the unsigned magnitude is zero, it is represented by a single zero character '0'; otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The following characters are used as hexadecimal digits:
0123456789abcdef
If uppercase letters are desired, the toUpperCase() method may be called on the result:
- Parameters
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value | - the int to be translated to an Octal string |
- Returns
- the unsigned int value as a Octal string
static std::string decaf::lang::Integer::toOctalString |
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int |
value | ) |
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Returns a string representation of the integer argument as an unsigned integer in base 8.
The unsigned integer value is the argument plus 2^32 if the argument is negative; otherwise, it is equal to the argument. This value is converted to a string of ASCII digits in octal (base 8) with no extra leading 0s.
If the unsigned magnitude is zero, it is represented by a single zero character '0'; otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The following characters are used as octal digits:
01234567
- Parameters
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value | - the int to be translated to an Octal string |
- Returns
- the unsigned int value as a Octal string
static std::string decaf::lang::Integer::toString |
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int |
value, |
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int |
radix |
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) |
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Returns a string representation of the first argument in the radix specified by the second argument.
If the radix is smaller than Character.MIN_RADIX or larger than Character.MAX_RADIX, then the radix 10 is used instead.
If the first argument is negative, the first element of the result is the ASCII minus character '-'. If the first argument is not negative, no sign character appears in the result.
The remaining characters of the result represent the magnitude of the first argument. If the magnitude is zero, it is represented by a single zero character '0'; otherwise, the first character of the representation of the magnitude will not be the zero character. The following ASCII characters are used as digits:
0123456789abcdefghijklmnopqrstuvwxyz
- Parameters
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value | - the int to convert to a string |
radix | - the radix to format the string in |
- Returns
- an int formatted to the string value of the radix given.