How to маке 1 variable appropriate random element from array

[Veliko]

Guys how can i make 1 variable appropriate random element from an array for example

 #nclude <iostream>
using namespace std;
int main ()
{int Deck[52]={2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5}// this is a deck of cards
a=(random element from the array "Deck")//  a= we put random element from the array 
cout<<a<<endl;

[Cody0023]

um what? I guess you're trying to select and element randomly, so

#include<iostream>
#include<cstdlib>
#include<ctime>
using namespace std;

int main()
{

srand(time(NULL));
int h=rand()%53;
Deck[h];
}

[Mathhead200]

Getting a random element from an array is as easy as getting a random index. Since the indices of an array range from 0 to n - 1, it's as simple as getting a random integer in said range.

#include <iostream>
#include <random>

using namespace std;

int main() {
	// Set up the deck
	const int N = 52; //size of 'deck'
	int deck[N];
	//TODO: fill deck...
	
	// Create a (pseudo) random number generator (C++11 style)
	random_device dev;
	uniform_int_distribution<> random(0, N - 1);
	
	// Pick then print a random element from the deck
	int index = random(dev); //generate a random number
	cout << deck[index] << endl; //then get the random element, and print it
	
	return 0;
}

See: http://en.cppreference.com/w/cpp/numeric/random/uniform_int_distribution

[Veliko]

I want to put an elemet from the array in the index and then make different task depending on the element of the index.

#include <iostream>
using namespace std;
#include <random>
#include <string>
string Deck [8]={"2s","2k","2kp","2p","3s","3k","3kp","3p"};
int main ()
{
const int n=8;
random_device dev;
uniform_int_distribution<> random(0, n - 1);
int index=random(dev); string a;
a=Deck[index];
if (a=2s) cout<<"Two of spade"<<a<<endl;//2s is two of spade
if (a=2k) cout<<"Two of diamond"<<a<<endl;//2k is two of diomond
if (a=2kp) cout<<"Two of heart "<<a<<endl;//2kp is two of heart
if (a=2p) cout<<"two of clubs"<<a<<endl;//2p is Two of clubs
else cout<<"you hit tree you loose"<<a<<endl;
return 0;
}

this code doesen't work BTW it's just an example

[Mathhead200]

Should work. You just want to replace a=2s with a=="2s". Also, whenever you have a sequence of if-statements that are mutually exclusive, you optimize performance (and follow convention) by instead writing the first as if and all the following as else if, except the last which is simply else as you have it.

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

using namespace std; //always put using after the includes!


string Deck [8]={"2s","2k","2kp","2p","3s","3k","3kp","3p"};
const int n=8; //should be defined in the same scope as the array

int main ()
{
random_device dev;
uniform_int_distribution<> random(0, n - 1);
int index=random(dev); string a;
a=Deck[index];
if (a=="2s") cout<<"Two of spade"<<a<<endl;//2s is two of spade
else if (a=="2k") cout<<"Two of diamond"<<a<<endl;//2k is two of diomond
else if (a=="2kp") cout<<"Two of heart "<<a<<endl;//2kp is two of heart
else if (a=="2p") cout<<"two of clubs"<<a<<endl;//2p is Two of clubs
else cout<<"you hit tree you loose"<<a<<endl;
return 0;
}

What exactly is the question, or does that answer it?

[Veliko]

Yes it worked thanks a lot you helped me a lot :)))