function to output specific no. of chars of string

[tyler]

i'm trying to use a function to define a string and then calling its value in the main function. the problem is that i have to output only a specific number of elements of the string, not the whole string. i've reached this far right now, someone kindly guide me further :

#include <iostream>

using namespace std;

void letters (string a)

{

cout << a << endl;

}

int main()

{

string one;

cin >> one;
letters (one);

return 0;

}

[Mitsakos]

You can use the substr() function to use part of the string.
Here is it's documentation:
http://www.cplusplus.com/reference/string/string/substr.html