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| /* | |
| A Tour of Go: page 44 | |
| http://tour.golang.org/#44 | |
| Exercise: Loops and Functions | |
| As a simple way to play with functions and loops, implement the square root function using Newton's method. | |
| In this case, Newton's method is to approximate Sqrt(x) by picking a starting point z and then repeating: z - (z*z - x) / (2 * z) |