在C语言中，如果一个函数需要返回多个数据，有几种做法：

1，构造一个struct，将多个返回值封装为一个struct。

2，使用指针参数，使函数可以修改传入的参数变量。

在Scala中，就不需要这么费劲了，我们可以使用Tuple来返回任意个数据。

a tuple combines a fixed number of items together so that they can be passed around as a whole. Unlike an array or list, a tuple can hold objects with different types. Here is an example of a tuple holding an integer, a string, and the console:

Tuples save you the tedium of defining simplistic data-heavy classes. Even though defining a class is already easy, it does require a certain minimum effort, which sometimes serves no purpose. Tuples save you the effort of choosing a name for the class, choosing a scope to define the class in, and choosing names for the members of the class. If your class simply holds an integer and a string, there is no clarity added by defining a class named AnIntegerAndAString.

编程示例如下：

object S007_Tuples {
	def returnTuple: (Int, String) = {
		val name = "laomeng";
		val id = 100
		return (id, name)
	}
	def main(args: Array[String]): Unit = {
		val pair = (1, 2, 3, "mengguang");
		println(pair._1);
		println(pair._4);
		println(pair.toString);
		val (x, y) = returnTuple
		println(x)
		println(y)
	}
}

参考资料：

http://www.artima.com/pins1ed/collections.html