std::stoi, std::stol, std::stoll
From Cppreference
| Defined in header <string>
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| int stoi( const std::string& str, size_t *pos = 0, int base = 10 );
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(1) | (C++11 feature) |
| long stol( const std::string& str, size_t *pos = 0, int base = 10 );
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(2) | (C++11 feature) |
| long long stoll( const std::string& str, size_t *pos = 0, int base = 10 );
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(3) | (C++11 feature) |
Interprets a signed integer value in the string str.
Function discards any whitespace characters until first non-whitespace character is found. Then it 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)
- (optional) prefix (0x or 0X) indicating hexadecimal base (applies only when the base is 16)
- a sequence of digits
The set of valid digits for base-2 integer is 01, for base-3 integer is 012, 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.
The index of the first unconverted character is stored in pos. If NULL is passed as pos, it is ignored.
Contents |
[edit] Parameters
| str | - | the string to convert |
| pos | - | address of an integer to store the index of the first unconverted character |
| base | - | the number base |
[edit] Return value
The string converted to the specified signed integer type.
[edit] Exceptions
std::invalid_argument if no conversion could be performed
std::out_of_range if the converted value would fall out of the range of the result type.
[edit] Example
std::string test = "45"; int myint = stoi(test);
[edit] See also
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converts a string to an unsigned integer (function) |
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converts a string to an floating point value (function) |
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