a.swift

//Swift

var primate = "monkey"
var delicousTreat: String = "donut"
let plant = "pine tree"

func combineThings(thing1: String, thing2: String) -> String{
    let newThing = thing1 + " " + thing2
    return newThing
}

combineThings(primate, deliciousTreat)
//returns "monkey donut"

b.cs

//C#

var primate = "monkey";
string delicousTreat = "donut";
const plant = "pine tree";

string combineThings(string thing1, string thing2)
{
    var newThing = thing1 + " " + thing2;
    return newThing;
}
combineThings(primate, delicousTreat);
//returns "monkey donut"