basic_string substr( size_type pos = 0,
size_type count = npos ) const; |
Returns a substring [pos, pos+count). If the requested substring extends past the end of the string, or if count == npos, the returned substring is [pos, size()).
Parameters
| pos | - | position of the first character to include |
| count | - | length of the substring |
Return value
- An empty string if pos ==
size(). - String containing the substring
[pos, pos+count).
Exceptions
std::out_of_range if pos > size().
Complexity
Linear in count.
Example
#include <string>
#include <iostream>
int main()
{
std::string a = "0123456789abcdefghij";
std::string sub1 = a.substr(10);
std::cout << sub1 << '\n';
std::string sub2 = a.substr(5, 3);
std::cout << sub2 << '\n';
std::string sub3 = a.substr(12, 100);
std::cout << sub3 << '\n';
std::string sub4 = a.substr(a.size()-3, 50);
std::cout << sub4 << '\n';
}Output:
abcdefghij 567 cdefghij hij
See also
| copies characters (public member function) | |
| returns the number of characters (public member function) | |
| find characters in the string (public member function) |
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