package main
import "fmt"
func main(){
  fmt.Println(fibonacci(34))
}
func fibonacci(i int) int{
  if(i<2){
    return i;
  }
  return fibonacci(i-2) + fibonacci(i-1);
}

def fibonacci(i):
  if i<2:
    return i
  return fibonacci(i-2) + fibonacci(i-1)
 
print(fibonacci(34))

qiangjian@localhost:/works/learnCPP$ python2 -V && time python2 ./fib.py 
Python 2.7.13
5702887

real 0m2.651s
user 0m2.594s
sys 0m0.027s

qiangjian@localhost:/works/learnCPP$ python3 -V && time python3 ./fib.py 
Python 3.5.1

real  0m3.110s
user  0m2.982s
sys   0m0.026s

<?php
function fibonacci($i){
  if($i<2) return $i;
  return fibonacci($i-2) + fibonacci($i-1);
}
echo fibonacci(34);

qiangjian@localhost:/works/learnCPP$ php54 -v && time php54 fib.php 
PHP 5.4.43 (cli) (built: Dec 21 2016 12:01:59) 
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies
real  0m2.288s
user  0m2.248s
sys   0m0.021s

qiangjian@localhost:/works/learnCPP$ php -v && time php fib.php 
PHP 5.6.28 (cli) (built: Dec 6 2016 12:38:54) 
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
real  0m2.307s
user  0m2.278s
sys   0m0.017s

qiangjian@localhost:/works/learnCPP$ php -v && time php fib.php
PHP 7.1.2 (cli) (built: Feb 17 2017 10:52:17) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies
5702887
real  0m0.815s
user  0m0.780s
sys   0m0.015s

#include <iostream>
 
constexpr int fibonacci(const int i){
  if(i<2) return i;
  return fibonacci(i-2) + fibonacci(i-1);
}
 
int main() {
  fibonacci(34);
  return 0;
}

qiangjian@localhost:/works/learnCPP$ time g++-6 -o a.bin main.cpp && time ./a.bin 

real  0m0.378s
user  0m0.254s
sys   0m0.104s

real  0m0.050s
user  0m0.043s
sys   0m0.002s

qiangjian@localhost:/works/learnCPP$ time g++-6 -O2 -o a.bin main.cpp && time ./a.bin 

real  0m0.874s
user  0m0.344s
sys   0m0.180s

real  0m0.034s
user  0m0.019s
sys   0m0.004s

#include <stdio.h>
 
int fibonacci(int i){
  if(i<2) return i;
  return fibonacci(i-2) + fibonacci(i-1);
}
int main(){
  printf("%d",fibonacci(34));
}

qiangjian@localhost:/works/learnCPP$ time gcc-6 -o c.bin fib.c && time ./c.bin 

real  0m0.341s
user  0m0.063s
sys   0m0.101s
real  0m0.049s
user  0m0.044s
sys   0m0.002s

qiangjian@localhost:/works/learnCPP$ time gcc-6 -O2 -o c.bin fib.c && time ./c.bin 

real  0m0.143s
user  0m0.065s
sys   0m0.034s
real  0m0.034s
user  0m0.028s
sys   0m0.002s

class Fib{
  public  static void main(String[] args){
    System.out.println(fibonacci(34));
 
  }
 
  static int fibonacci( int i){
    if(i<2) return i;
    return fibonacci(i-2) + fibonacci(i-1);
  }
}

qiangjian@localhost:/works/learnCPP$ java -version && time javac Fib.java && time java Fib 
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

real  0m0.952s
user  0m1.302s
sys   0m0.144s

real  0m0.150s
user  0m0.123s
sys   0m0.025s

function fibonacci(i){
  if(i<2) return i;
  return fibonacci(i-2) + fibonacci(i-1);
}
console.log(fibonacci(34))

qiangjian@localhost:/works/learnCPP$ node -v && time node fib.js 
v6.10.0

real  0m0.332s
user  0m0.161s
sys   0m0.062s