Password Gen inc File Saving And Clipboard Saving

Question

So finally got my password generator to work.

#include <iostream>
#include <stdlib.h>
#include <string>
#include <time.h>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <ctime>
#include <Windows.h>

using namespace std;

void copytoclip(string stringpassword) {
//Saves to ClipBoard
const char * c = stringpassword.c_str(); //Sets the clipboard with the varaible wanting to save
const size_t len = strlen(c) + 1;
HGLOBAL hMem = GlobalAlloc(GMEM_MOVEABLE, len);
memcpy(GlobalLock(hMem), c, len);
GlobalUnlock(hMem);
OpenClipboard(0);
EmptyClipboard();
SetClipboardData(CF_TEXT, hMem);
CloseClipboard();
}

void savePassword(string stringpassword, string site) {
string path = string(getenv("USERPROFILE")) + "\\Documents\\output.txt"; // Gets the user profile to save too.
ofstream out(path, ofstream::app); // Here
out << site << ": " << stringpassword << endl; // This is where it saves the password into the text file
out.close(); // Closes file
cout << "File Saved" << endl;

}

int passwordgen() {
system("CLS");
string stringpassword; // New string for password
srand((unsigned)time(0)); // Sets up for a random time
int randomnum; // Just a varible for randomnumber
string site;
cout << "What site/program do you want this password for? ";
cin >> site;
Sleep(500);
system("CLS");
for (int i = 0; i < 13; i++) // Loop 0-12
{
randomnum = (rand() % 89) + 65; // Generates between 65 and 122 (65+58=123 because you need 1 more.)

do {
randomnum = (rand() % 89) + 33; // Generates between 65 and 122 (65+58=123 because you need 1 more.)
} while ((randomnum >= 32 && randomnum <= 41) || (randomnum >= 58 && randomnum <= 64) || (randomnum >= 91 && randomnum <= 96)); // Keeps generating until there is a valid number

stringpassword += randomnum; // Adds the character to the string

} // for loop

cout << "Password Is: " << stringpassword << endl << endl << "Password Copied to clipboard" << endl << endl;

savePassword(stringpassword, site);
copytoclip(stringpa