http://tour.golang.org/#15 encourages the learner to remove the "float64"
conversion from line 10:
var f float64 = math.Sqrt(float64(3*3 + 4*4))
Removing it does nothing (it still compiles), as the constants are untyped. The
concept of untyped constants is introduced after this in #17, and line 9
declares x and y as 3 and 4, so I think we should have:
var f float64 = math.Sqrt(float64(x*x + y*y))
Then removing the conversion has the right effect; people will see that Go
requires you to be explicit when converting:
prog.go:10: cannot use x * x + y * y (type int) as type float64 in function
argument
Original issue reported on code.google.com by p...@google.com on 9 Mar 2014 at 9:18
Original issue reported on code.google.com by
p...@google.com
on 9 Mar 2014 at 9:18