Documentation
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Index ¶
- Constants
- func AppendBool(dst []byte, b bool) []byte
- func AppendComplex(dst []byte, c complex128, fmt byte, prec, bitSize int) []byte
- func AppendFloat(dst []byte, f float64, fmt byte, prec, bitSize int) []byte
- func AppendInt(dst []byte, i int64, base int) []byte
- func AppendUint(dst []byte, i uint64, base int) []byte
- func Atoi(s string) (int, error)
- func FormatBool(b bool) string
- func FormatComplex(c complex128, fmt byte, prec, bitSize int) string
- func FormatFloat(f float64, fmt byte, prec, bitSize int) string
- func FormatInt(i int64, base int) string
- func FormatUint(i uint64, base int) string
- func Itoa(i int) string
- func ParseBool(str string) (bool, error)
- func ParseComplex(s string, bitSize int) (complex128, error)
- func ParseFloat(s string, bitSize int) (float64, error)
- func ParseInt(s string, base int, bitSize int) (i int64, err error)
- func ParseUint(s string, base int, bitSize int) (uint64, error)
- func RuntimeFormatBase10(a []byte, u uint64) int
- type Error
Constants ¶
const IntSize = intSize
IntSize is the size in bits of an int or uint value.
Variables ¶
This section is empty.
Functions ¶
func AppendBool ¶
AppendBool appends "true" or "false", according to the value of b, to dst and returns the extended buffer.
func AppendComplex ¶
func AppendComplex(dst []byte, c complex128, fmt byte, prec, bitSize int) []byte
AppendComplex appends the result of FormatComplex to dst. It is here for the runtime. There is no public strconv.AppendComplex.
func AppendFloat ¶
AppendFloat appends the string form of the floating-point number f, as generated by FormatFloat, to dst and returns the extended buffer.
func AppendInt ¶
AppendInt appends the string form of the integer i, as generated by FormatInt, to dst and returns the extended buffer.
func AppendUint ¶
AppendUint appends the string form of the unsigned integer i, as generated by FormatUint, to dst and returns the extended buffer.
func FormatBool ¶
FormatBool returns "true" or "false" according to the value of b.
func FormatComplex ¶
func FormatComplex(c complex128, fmt byte, prec, bitSize int) string
FormatComplex converts the complex number c to a string of the form (a+bi) where a and b are the real and imaginary parts, formatted according to the format fmt and precision prec.
The format fmt and precision prec have the same meaning as in FormatFloat. It rounds the result assuming that the original was obtained from a complex value of bitSize bits, which must be 64 for complex64 and 128 for complex128.
func FormatFloat ¶
FormatFloat converts the floating-point number f to a string, according to the format fmt and precision prec. It rounds the result assuming that the original was obtained from a floating-point value of bitSize bits (32 for float32, 64 for float64).
The format fmt is one of
- 'b' (-ddddp±ddd, a binary exponent),
- 'e' (-d.dddde±dd, a decimal exponent),
- 'E' (-d.ddddE±dd, a decimal exponent),
- 'f' (-ddd.dddd, no exponent),
- 'g' ('e' for large exponents, 'f' otherwise),
- 'G' ('E' for large exponents, 'f' otherwise),
- 'x' (-0xd.ddddp±ddd, a hexadecimal fraction and binary exponent), or
- 'X' (-0Xd.ddddP±ddd, a hexadecimal fraction and binary exponent).
The precision prec controls the number of digits (excluding the exponent) printed by the 'e', 'E', 'f', 'g', 'G', 'x', and 'X' formats. For 'e', 'E', 'f', 'x', and 'X', it is the number of digits after the decimal point. For 'g' and 'G' it is the maximum number of significant digits (trailing zeros are removed). The special precision -1 uses the smallest number of digits necessary such that ParseFloat will return f exactly. The exponent is written as a decimal integer; for all formats other than 'b', it will be at least two digits.
func FormatInt ¶
FormatInt returns the string representation of i in the given base, for 2 <= base <= 36. The result uses the lower-case letters 'a' to 'z' for digit values >= 10.
func FormatUint ¶
FormatUint returns the string representation of i in the given base, for 2 <= base <= 36. The result uses the lower-case letters 'a' to 'z' for digit values >= 10.
func ParseBool ¶
ParseBool returns the boolean value represented by the string. It accepts 1, t, T, TRUE, true, True, 0, f, F, FALSE, false, False. Any other value returns an error.
func ParseComplex ¶
func ParseComplex(s string, bitSize int) (complex128, error)
ParseComplex converts the string s to a complex number with the precision specified by bitSize: 64 for complex64, or 128 for complex128. When bitSize=64, the result still has type complex128, but it will be convertible to complex64 without changing its value.
The number represented by s must be of the form N, Ni, or N±Ni, where N stands for a floating-point number as recognized by ParseFloat, and i is the imaginary component. If the second N is unsigned, a + sign is required between the two components as indicated by the ±. If the second N is NaN, only a + sign is accepted. The form may be parenthesized and cannot contain any spaces. The resulting complex number consists of the two components converted by ParseFloat.
The errors that ParseComplex returns have concrete type [*NumError] and include err.Num = s.
If s is not syntactically well-formed, ParseComplex returns err.Err = ErrSyntax.
If s is syntactically well-formed but either component is more than 1/2 ULP away from the largest floating point number of the given component's size, ParseComplex returns err.Err = ErrRange and c = ±Inf for the respective component.
func ParseFloat ¶
ParseFloat converts the string s to a floating-point number with the precision specified by bitSize: 32 for float32, or 64 for float64. When bitSize=32, the result still has type float64, but it will be convertible to float32 without changing its value.
ParseFloat accepts decimal and hexadecimal floating-point numbers as defined by the Go syntax for floating-point literals. If s is well-formed and near a valid floating-point number, ParseFloat returns the nearest floating-point number rounded using IEEE754 unbiased rounding. (Parsing a hexadecimal floating-point value only rounds when there are more bits in the hexadecimal representation than will fit in the mantissa.)
The errors that ParseFloat returns have concrete type *NumError and include err.Num = s.
If s is not syntactically well-formed, ParseFloat returns err.Err = ErrSyntax.
If s is syntactically well-formed but is more than 1/2 ULP away from the largest floating point number of the given size, ParseFloat returns f = ±Inf, err.Err = ErrRange.
ParseFloat recognizes the string "NaN", and the (possibly signed) strings "Inf" and "Infinity" as their respective special floating point values. It ignores case when matching.
func ParseInt ¶
ParseInt interprets a string s in the given base (0, 2 to 36) and bit size (0 to 64) and returns the corresponding value i.
The string may begin with a leading sign: "+" or "-".
If the base argument is 0, the true base is implied by the string's prefix following the sign (if present): 2 for "0b", 8 for "0" or "0o", 16 for "0x", and 10 otherwise. Also, for argument base 0 only, underscore characters are permitted as defined by the Go syntax for integer literals.
The bitSize argument specifies the integer type that the result must fit into. Bit sizes 0, 8, 16, 32, and 64 correspond to int, int8, int16, int32, and int64. If bitSize is below 0 or above 64, an error is returned.
The errors that ParseInt returns have concrete type [*NumError] and include err.Num = s. If s is empty or contains invalid digits, err.Err = ErrSyntax and the returned value is 0; if the value corresponding to s cannot be represented by a signed integer of the given size, err.Err = ErrRange and the returned value is the maximum magnitude integer of the appropriate bitSize and sign.
func ParseUint ¶
ParseUint is like ParseInt but for unsigned numbers.
A sign prefix is not permitted.
func RuntimeFormatBase10 ¶
RuntimeFormatBase10 formats u into the tail of a and returns the offset to the first byte written to a. It is only for use by package runtime. Other packages should use AppendUint.
Source Files