Cpp program to divide the string in equal parts and sort out the substrings

string_divide.cpp

#include <iostream>
#include <cstdlib>
#include <cstring>
#include <vector>
#include <algorithm>

using namespace std;

class str_op {
	string s;

public:
	str_op(string str) {
		s = str;
	}
	str_op() {
		string st;
		cout<<"Input String: ";
		cin>>st;
		s = st;
	}
	vector<string> str_fun();
	void str_print(vector<string>);
};

int s_div(int nn) {
	int s=1;
	for (int i=2;i<nn;i++) {
		if(nn%i==0) {
			s=i;
			break;
		}
	}
	return s;
}


int main() {
	str_op s;
	vector<string> str_arr = s.str_fun();
	s.str_print(str_arr);
	return 0; 

}

vector<string> str_op::str_fun() {
	int n = s.length();
	int mult = s_div(n);
	vector<string> s_arr;
	for (int i=0;i<n;i+=mult) {
		s_arr.push_back(s.substr(i,mult));
	}
	sort(s_arr.begin(), s_arr.end());
	return s_arr;
}

void str_op::str_print(vector<string> v) {
	for(vector<string>::const_iterator i = v.begin();i!=v.end();++i) {
		cout<<*i<<endl;
	}
}