kjk

#include <iostream>

constexpr long long factorial(int n)
{
  long long result = 1;
  for (int i = 1; i <= n; ++i) {
    result *= i;
  }
  return result;
}

kjk

#include <iostream>

constexpr long long factorial(long long n)
{
  if (n == 0)
    return 1;
  else
    return n * factorial(n - 1);
}

kjk

#include <iostream>

constexpr long long factorial(long long n)
{
  return (n == 0) ? 1 : n * factorial(n - 1);
}

int main()
{
  char test[factorial(3)];

kjk

#include <iostream>
#include <type_traits>

template<long long n>
struct factorial :
  std::integral_constant<long long, n * factorial<n - 1>::value> {};

template<>
struct factorial<0> :
  std::integral_constant<long long, 1> {};

kjk

#include <iostream>

template<unsigned int n>
struct factorial
{
    enum
    {
        value = n * factorial<n - 1>::value
    };
};

kjk

package main

import (
	"archive/zip"
	"fmt"
	"io"
	"log"
	"os"
	"path/filepath"
)

kjk

Source code examples:
* https://grep.app/search?q=IApplicationAssociationRegistration&filter[lang][0]=C%2B%2B
* https://github.com/QupZilla/qupzilla/blob/master/src/lib/other/registerqappassociation.cpp
* https://github.com/mpc-hc/mpc-hc/blob/master/src/mpc-hc/FileAssoc.cpp
* https://github.com/syndicodefront/infekt/blob/master/src/win32/default_app_win7.cpp
* https://github.com/syndicodefront/infekt/blob/master/src/win32/default_app_win8.cpp

In gecko-dev source code:
* Telemetry.cpp

kjk

package main

// https://blog.kowalczyk.info/article/wOYk/advanced-command-execution-in-go-with-osexec.html

import (
	"bytes"
	"fmt"
	"io"
	"log"
	"os"

kjk

package main

// https://blog.kowalczyk.info/article/wOYk/advanced-command-execution-in-go-with-osexec.html

import (
	"fmt"
	"os/exec"
)

func checkExeExists(exe string) {

kjk

package main

// https://blog.kowalczyk.info/article/wOYk/advanced-command-execution-in-go-with-osexec.html

import (
	"fmt"
	"log"
	"os"
	"os/exec"
)