How to put an element of a string to a vector? - c++

Question

I want to put specific elements of a string to a vector<string>.
To give you a better explanation of what i intend to do:
string str;
vector<string> in;
cin >> str; // input: abc
for(int i = 0;i < str.length();i++) {
in.push_back(&str[i]);
}
now i want the first element of vector<string> in to be "a" (in[0] = "a"), the second to be b etc.. i want to use strings for this. Is it possible to do it because when i print the vector it gives me that first it has abc then bc and in the end only c?

Answer 1

std::string has a constructor that takes a integral count and a single char to instantiate a string with n elements of the same value. You can use this and the fact that std::strings is much like a container of char:
for (auto c : str)
in.emplace_back(1ul, c);
Alternatively, you can store single char in the vector instead of std::string:
std::vector<char> in(str.begin(), str.end());

Answer 2

Either use std::vector<char> or use substr.
Example 1:
#include <string>
#include <iostream>
#include <vector>
int main()
{
std::string str;
std::vector<char> in;
std::cin >> str; // input: abc
for (std::string::size_type i = 0; i < str.length(); i++) {
in.push_back(str[i]);
}
}
Or a simpler variant:
int main()
{
std::string str;
std::cin >> str; // input: abc
std::vector<char> in(str.begin(), str.end());
}
Example 2:
#include <string>
#include <iostream>
#include <vector>
int main()
{
std::string str;
std::vector<std::string> in;
std::cin >> str; // input: abc
for (std::string::size_type i = 0; i < str.length(); i++) {
in.push_back(str.substr(i, 1));
}
}