//
// card_dealer.cpp
// ---------------
//
// g++-11 -fcoroutines -Wall -Werror card_dealer.cpp -o dealer
//

#include <coroutine>
#include <random>
#include <array>
#include <string>

#include <iostream>

template <typename T> struct generator {
  struct promise_type;
  using coroutine_handle = std::coroutine_handle<promise_type>;

  struct promise_type {
    T current_value;

    auto get_return_object() {
      return generator{coroutine_handle::from_promise(*this)};
    }

    // Start 'lazily' i.e. suspend ('eagerly' == 'suspend_never').
    auto initial_suspend() { return std::suspend_always{}; }

    // Opportunity to publish results, signal completion etc. Suspend
    // so that destroy() is called via RAII from outside the coroutine.
    auto final_suspend() noexcept { return std::suspend_always{}; }

    void unhandled_exception() { std::terminate(); }

    auto yield_value(T const &value) {
      current_value = value;
      return std::suspend_always{};
    }
  };

  bool next() {
    return coroutine ? (coroutine.resume(), !coroutine.done())
                     : false;
  }

  T value() { return coroutine.promise().current_value; }

  // Range support, class design etc.

  ~generator() {
    if (coroutine)
      coroutine.destroy();
  }

private:
  generator(coroutine_handle h) : coroutine(h) {}
  coroutine_handle coroutine;
};

generator<std::string> card_dealer(int deck_size) {
  std::default_random_engine rng;
  std::uniform_int_distribution<int> card(0, 12);
  std::uniform_int_distribution<int> suit(0, 3);

  std::array<std::string, 13> cards = {
      "Ace", "2", "3", "4", "5", "6", "7",
      "8", "9", "10", "Jack", "Queen", "King"};

  std::array<std::string, 4> suits = {"Clubs", "Diamonds",
                                      "Spades", "Hearts"};

  for (int i = 0; i < deck_size; i++)
    co_yield(cards[card(rng)] + " of " + suits[suit(rng)]);
}

int main() {
  generator<std::string> dealer = card_dealer(100);

  while (dealer.next())
    std::cout << dealer.value() << std::endl;
}
by

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}