srand() ajutor.

[Begedeu]

Buna seara . Am facut un program in c++ , un joculet in care trebuie sa ghicesti numarul dat de computer .

As vrea sa stiu cum se face un program pe "dos" in care eu sa dau un numar si computerul sa-l ghiceasca .

Multumesc .

Aici programul , ma rog prima parte cu username si pass am vrut sa fac eu ceva dar imi mai trebuie cunostinte .

#include <cstdlib>
#include <iostream>
#include <ctime>
#include <string>
using namespace std;
int main(){
    srand(time(0));
    int numarul=(rand() % 100) +1;
    int incercari=0,guess;
    cout <<"\tBine ai venit la ghiceste-mi numarul\n\n";
    string username;cout<<"Username: ";cin>>username;
    string password;cout<<"Password: ";cin>>password;
    if (username == "BGD" && password == "blabla") cout <<"Welcome " <<username<< " to our game\n";
    else cout <<"Login failed\n";
    do
    {
         cout<<"Ghiceste numarul ";cin>>guess;++incercari;
         if (guess < numarul) cout <<"Mai mult\n";
         else cout<<"Mai putin\n";
         }while(guess!=numarul);
         cout <<"\nBravo ai reusit din " <<incercari<< " incercari";
         cin.ignore(cin.rdbuf()->in_avail() +1);
         getchar();
         return 0;
         }

[Ganav]

Nu este o idee prea buna sa lasi computerul sa-l ghiceasca. Practic se transforma intr-o problema de bruteforcing. NU folosi srand() ci /dev/urandom. srand() nu este chiar atat de random precum se doreste. Ai putea citi numarul de la tastatura:

int n;
std::cout << "Introduceti un numar:";
std::cin >> n;

Acum citim octeti din std::random_device:

#include <iostream>
#include <string>
#include <map>
#include <random>

int main()
{
    std::random_device rd;
    std::map<int, int> hist;
    std::uniform_int_distribution<int> dist(0, 9);
    for (int n = 0; n < 20000; ++n) {
        ++hist[dist(rd)]; // note: demo only: the performance of many 
                          // implementations of random_device degrades sharply
                          // once the entropy pool is exhausted. For practical use
                          // random_device is generally only used to seed 
                          // a PRNG such as mt19937
    }
    for (auto p : hist) {
        std::cout << p.first << " : " << std::string(p.second/100, '*') << '\n';
    }
}

Sursa:

std::random_device - cppreference.com

[Begedeu]

Multumesc frumos @Ganav .