lang

C++
#include <iostream>
void greet(std::string name) {
    std::cout << "Hello " << name << "!";
}
int main() {
    std::string name;
    std::cin >> name;
    greet(name);
}

java
import java.util.Scanner;
class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        greet((String)s.next());

    }
    public static void greet(String name) {
        System.out.println("Hello " + name + "!");
    }
}

python
def greet(name):
    print("Hello " + name + "!")
greet(input())

C#
using System;
namespace Test {
    class Test {
        public static void greet(object name) {
            Console.WriteLine("Hello " + name + "!");
        }
        public static void Main(string[] args) {
            greet(Console.ReadLine());
        }
    }
}

JS (rhino)
importPackage(java.io);
importPackage(java.lang);
var input = new BufferedReader( new InputStreamReader(System['in']) )
print("Hello " + input.readLine() + "!");

Swift
func greet(person: String) {
    print("Hello " + person + "!")
}
if let str = readLine(){
greet(person: str)
}

PHP
<?php
function greet($person) {
    echo "Hello $person!";
}
greet(readline());
?>