string substr c++
s.substr(pos,len);c++ substring
// string::substr
#include <iostream>
#include <string>
int main ()
{
std::string str="We think in generalities, but we live in details.";
// (quoting Alfred N. Whitehead)
std::string str2 = str.substr (3,5); // "think"
std::size_t pos = str.find("live"); // position of "live" in str
std::string str3 = str.substr (pos); // get from "live" to the end
std::cout << str2 << ' ' << str3 << '\n';
return 0;
}string c++ substr
#include <string>
#include <iostream>
int main()
{
std::string a = "0123456789abcdefghij";
// count is npos, returns [pos, size())
std::string sub1 = a.substr(10);
std::cout << sub1 << '\n';
// both pos and pos+count are within bounds, returns [pos, pos+count)
std::string sub2 = a.substr(5, 3);
std::cout << sub2 << '\n';
// pos is within bounds, pos+count is not, returns [pos, size())
std::string sub4 = a.substr(a.size()-3, 50);
// this is effectively equivalent to
// std::string sub4 = a.substr(17, 3);
// since a.size() == 20, pos == a.size()-3 == 17, and a.size()-pos == 3
std::cout << sub4 << '\n';
try {
// pos is out of bounds, throws
std::string sub5 = a.substr(a.size()+3, 50);
std::cout << sub5 << '\n';
} catch(const std::out_of_range& e) {
std::cout << "pos exceeds string size\n";
}
}substring function in c++
string sub_string=main_string.substr(first_pos_of_the_substring_from_main_string,length_of_the_substring_from_main_string_starting_from_the_first_positioncpp substring
#include <iostream>
#include <string>
using namespace std;
void cpp_strings()
{
string unformatted_full_name { "StephenHawking" };
string first_name = unformatted_full_name.substr(0, 7);
// string first_name { unformatted_full_name, 0, 7 };
string last_name = unformatted_full_name.substr(7, 7);
string formatted_full_name = first_name + last_name;
formatted_full_name.insert(7, " ");
cout << formatted_full_name;
}
int main()
{
cpp_strings();
return 0;
}Copyright © 2021 Codeinu
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