#include <stdlib.h>
#include <new>

void password_generator(int length_password)
{
     int number_of_small_chars = rand() % length_password;
     int balance_rand = length_password - number_of_small_chars;
     int number_of_big_chars = rand() % balance_rand;
     int number_of_numeral = length_password - number_of_small_chars - 
number_of_big_chars;
     char* password = new char[length_password];

     for (int i = 0; i < number_of_numeral; ++i) {
         password[i] = char(rand() % 10 + 48);
     }

     for (int i = number_of_numeral; i < number_of_numeral + 
number_of_big_chars; ++i) {
         password[i] = char(rand() % 26 + 65);
     }

     for (int i = number_of_numeral + number_of_big_chars; i < length_password; 
++i) {
         password[i] = char(rand() % 26 + 97);
     }
}

int main()
{
	password_generator(10);
}