std::stoi, std::stol, std::stoll

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int       stoi( const std::string& str, size_t *pos = 0, int base = 10 );

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long      stol( const std::string& str, size_t *pos = 0, int base = 10 );

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long long stoll( const std::string& str, size_t *pos = 0, int base = 10 );

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Interprets a signed integer value in the string str.

Discards any whitespace characters (as identified by calling std::isspace) until the first non-whitespace character is found, then takes as many characters as possible to form a valid base-n (where n=base) integer number representation and converts them to an integer value. The valid integer value consists of the following parts:

• (optional) plus or minus sign
• (optional) prefix (0) indicating octal base (applies only when the base is 8 or ​0​)
• (optional) prefix (0x or 0X) indicating hexadecimal base (applies only when the base is 16 or ​0​)
• a sequence of digits

The set of valid values for base is {0,2,3,...,36}. The set of valid digits for base-2 integers is {0,1}, for base-3 integers is {0,1,2}, and so on. For bases larger than 10, valid digits include alphabetic characters, starting from Aa for base-11 integer, to Zz for base-36 integer. The case of the characters is ignored.

Additional numeric formats may be accepted by the currently installed C locale.

If the value of base is ​0​, the numeric base is auto-detected: if the prefix is 0, the base is octal, if the prefix is 0x or 0X, the base is hexadecimal, otherwise the base is decimal.

If the minus sign was part of the input sequence, the numeric value calculated from the sequence of digits is negated as if by unary minus in the result type.

The index of the first unconverted character is stored in pos. If Template:cpp is passed as pos, it is ignored.

Parameters

str	-	the string to convert
pos	-	address of an integer to store the index of the first unconverted character
base	-	the number base

Return value

The string converted to the specified signed integer type.

Exceptions

Template:cpp if no conversion could be performed

Template:cpp if the converted value would fall out of the range of the result type.

See also

Template:cpp/string/basic string/dcl list stoulTemplate:cpp/string/basic string/dcl list stof