string at() in C++
std::string::at can be used to extract characters by characters from a given string.
It supports two different syntaxes both having similar parameters:
char& string::at (size_type idx)
const char& string::at (size_type idx) const idx : index number Both forms return the character that has the index idx (the first character has index 0). For all strings, an index greater than or equal to length() as value is invalid. If the caller ensures that the index is valid, she can use operator , which is faster. Return value : Returns character at the specified position in the string. Exception : Passing an invalid index (less than 0 or greater than or equal to size()) throws an out_of_range exception.
std::string::at can be used for extracting characters from string. Here is the simple code for the same.
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