string substr() in C++

substr(): This function gets a substring of the given string from a specified 

position of fixed length. This function returns the new string

Parameters: 

__pos – Index of first character (default 0). 

__n – Number of characters in substring (default remainder). 

Syntax:

str.substr(__pos, __n)

For Example:

str = "abcdef"

str.substr(0,2) = > It returns "ab".

Approach

C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
    string str = "abcdef";

    cout << str.substr(0, 2) << "\n";

    return 0;
}