Difference between revisions of "cpp/string/byte/strtof"
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{{ddcl list begin}} | {{ddcl list begin}} | ||
{{ddcl list header | cstdlib}} | {{ddcl list header | cstdlib}} | ||
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float strtof( const char *str, char **str_end ); | float strtof( const char *str, char **str_end ); | ||
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double strtod( const char *str, char **str_end ); | double strtod( const char *str, char **str_end ); | ||
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long double strtold( const char *str, char **str_end ); | long double strtold( const char *str, char **str_end ); | ||
}} | }} | ||
Revision as of 14:54, 24 December 2011
Template:cpp/string/byte/sidebar Template:ddcl list begin <tr class="t-dsc-header">
<td><cstdlib>
<td></td> <td></td> </tr> <tr class="t-dcl ">
<td ><td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">
<td class="t-dcl-nopad"><td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr> <tr class="t-dcl ">
<td ><td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> Template:ddcl list end
Interprets a floating point value in a byte string pointed to by str.
Function discards any whitespace characters (as determined by std::isspace) until first non-whitespace character is found. Then it takes as many characters as possible to form a valid floating-point representation and converts them to a floating-point value. The valid floating-point value can be one of the following:
- decimal floating-point expression. It consists of the following parts:
- (optional) plus or minus sign
- nonempty sequence of decimal digits optionally containing decimal-point character (as determined by the current C locale) (defines significand)
- (optional)
eorEfollowed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent to base 10)
|
(since C++11) |
- any other expression that may be accepted by the currently installed C locale
The functions sets the pointer pointed to by str_end to point to the character past the last character interpreted. If str_end is Template:cpp, it is ignored.
Contents |
Parameters
| str | - | pointer to the null-terminated byte string to be interpreted |
| str_end | - | pointer to a pointer to character. |
Return value
floating point value corresponding to the contents of str on success. If the converted value falls out of range of corresponding return type, range error occurs and HUGE_VAL, HUGE_VALF or HUGE_VALL is returned. If no conversion can be performed, Template:cpp is returned.
| This section is incomplete Reason: fix links to limits |
