//var s = "hello";
var t = "world";
//print(s + " " + t);
//print ("s are \(s.count) caractere")


/*if s.hasPrefix("He") {
    print("Hello!");
}

s.insert("a", at:s.endIndex)
 */
var s = 0;
func suma(x:Int, y:Int) -> Int{

    s = x+y;
    return s;
}
s=suma(x:5, y:7);
print("Suma este \(s)")

var nr = "Hello"
var.insert("!", at:nr.endIndex);
var.insert("e", at:nr.Index(nr.startIndex, offsetBy:1));
print(nr[nr.startIndex])