সি++ ফাংশন

#include <iostream>
using namespace std;

  void message() {
    std::cout << "হ্যালো বিশ্ব";
  }

  int main() {
    message();

    return 0;
  }

#include <iostream>
using namespace std;

  void message() {
    std::cout << "হ্যালো বিশ্ব";
  }

  int main() {
    message();

    return 0;
  }

#include <iostream>
using namespace std;

  std::string message() {
    return "হ্যালো বিশ্ব";
  }

  int main() {
    std::cout << message();

    return 0;
  }

#include <iostream>
using namespace std;

  void message() {
    std::cout << "হ্যালো বিশ্ব";
  }

  int main() {
    message();

    return 0;
  }

#include <iostream>
using namespace std;

std::string user(
  const std::string& name,
  const std::string& land
) {
  return name + " - " + land;
}

int main() {

  std::cout << user("আরিফ", "বাংলাদেশ");

  return 0;
}

#include <iostream>
using namespace std;

void user(
  const std::string& name,
  const std::string& land
) {
  std::cout << name << " - " << land;
}

int main() {

  user("আরিফ", "বাংলাদেশ");

  return 0;
}

#include <iostream>
using namespace std;

void user(
  const std::string& name,
  const std::string& land = "বাংলাদেশ"
) {
  std::cout << name << " - " << land;
}

int main() {

  user("আরিফ");

  return 0;
}

#include <iostream>
using namespace std;

void reference(int& number) {
  number = 123456;
}

int main() {

  int number = 100;

  reference(number);

  std::cout << number;

  return 0;
}

#include <iostream>
using namespace std;

template<typename... Numbers>
auto sum(Numbers... numbers) {
  return (numbers + ...);
}

int main() {

  std::cout << sum(10, 15, 10, 25);

  return 0;
}

#include <iostream>
using namespace std;

template<typename... Numbers>
auto sum(Numbers... numbers) {
  return (numbers + ...);
}

int main() {

  std::tuple numbers = {
    10, 15, 10, 25
  };

  std::cout << std::apply(
    sum<decltype(std::get<0>(numbers)),
        decltype(std::get<1>(numbers)),
        decltype(std::get<2>(numbers)),
        decltype(std::get<3>(numbers))>,
    numbers
  );

  return 0;
}

#include <iostream>
using namespace std;

void counter(int number) {

  if (number <= 0) {
    return;
  }

  std::cout << "নাম্বার"
    << " "
    << number
    << std::endl;

  counter(number - 1);
}

int main() {

  counter(10);

  return 0;
}

#include <iostream>
using namespace std;

void outer() {

  auto inner = []() {
    return "হ্যালো বিশ্ব";
  };

  std::cout << inner();
}

int main() {

  outer();

  return 0;
}

#include <iostream>
using namespace std;

std::pair<std::string, std::string> user() {
  return {"আরিফ", "বাংলাদেশ"};
}

int main() {

  auto [name, land] = user();

  std::cout << name
    << " - "
    << land;

  return 0;
}

#include <iostream>
using namespace std;

void counting() {

  static int count = 0;

  count++;

  std::cout << count
    << std::endl;
}

int main() {

  counting();
  counting();
  counting();

  return 0;
}