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Getting Stod And Stoi To Work Dev C++

13.01.2021
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Nov 27, 2017  A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Mar 10, 2015  More string functions. Parses str interpreting its content as a floating-point number, which is returned as a value of type double. If idx is not a null pointer, the function also sets the value of idx to the position of the first character in str after the number. The function uses strtod (or wcstod) to perform the conversion (see strtod for more details on the process). Note that the format accepted by these.

< cpp‎ string‎ basic string
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Defined in header <string>
float stof(conststd::string& str, std::size_t* pos =0);
float stof(conststd::wstring& str, std::size_t* pos =0);
 (1) (since C++11)
double stod(conststd::string& str, std::size_t* pos =0);
double stod(conststd::wstring& str, std::size_t* pos =0);
 (2) (since C++11)
longdouble stold(conststd::string& str, std::size_t* pos =0);
longdouble stold(conststd::wstring& str, std::size_t* pos =0);
 (3) (since C++11)

Interprets a floating point value in a string str.

1) calls std::strtod(str.c_str(), &ptr) or std::wcstod(str.c_str(), &ptr)
(until C++17)
1) calls std::strtof(str.c_str(), &ptr) or std::wcstof(str.c_str(), &ptr)
(since C++17)
2) calls std::strtod(str.c_str(), &ptr) or std::wcstod(str.c_str(), &ptr)
3) calls std::strtold(str.c_str(), &ptr) or std::wcstold(str.c_str(), &ptr)

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)e or E followed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent to base 10)
  • hexadecimal floating-point expression. It consists of the following parts:
  • (optional) plus or minus sign
  • 0x or 0X
  • nonempty sequence of hexadecimal digits optionally containing a decimal-point character (as determined by the current C locale) (defines significand)
  • (optional)p or P followed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent to base 2)
  • infinity expression. It consists of the following parts:
  • (optional) plus or minus sign
  • INF or INFINITY ignoring case
  • not-a-number expression. It consists of the following parts:
  • (optional) plus or minus sign
  • NAN or NAN(char_sequence) ignoring case of the NAN part. char_sequence can only contain digits, Latin letters, and underscores. The result is a quiet NaN floating-point value.
  • any other expression that may be accepted by the currently installed C locale

If pos is not a null pointer, then a pointer ptr, internal to the conversion functions, will receive the address of the first unconverted character in str.c_str(), and the index of that character will be calculated and stored in *pos, giving the number of characters that were processed by the conversion.

[edit]Parameters

str - the string to convert
pos - address of an integer to store the number of characters processed

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[edit]Return value

The string converted to the specified floating point type.

[edit]Exceptions

std::invalid_argument if no conversion could be performed

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std::out_of_range if the converted value would fall out of the range of the result type or if the underlying function (strtof, (since C++17)strtod or strtold) sets errno to ERANGE.

[edit]See also

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(C++11)(C++11)(C++11)
 converts a string to a signed integer
(function)[edit]
(C++11)(C++11)
 converts a string to an unsigned integer
(function)[edit]
(C++17)
 converts a character sequence to an integer or floating-point value
(function)[edit]

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