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_content/tour: document no newline before else #225

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14 changes: 14 additions & 0 deletions _content/tour/flowcontrol.article
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Expand Up @@ -69,6 +69,20 @@ of the `else` blocks.
(Both calls to `pow` return their results before the call to `fmt.Println`
in `main` begins.)

Because of the way Go parses source code you must put the `else` on the same line
as the closing brace of the associated `if` block.
`else` after a newline generates a syntax error:

if v := math.Pow(x, n); v < lim {
return v
}
else { // syntax error: unexpected else, expecting }
fmt.Printf("%g >= %g\n", v, lim)
}

If you are interested in details on why this is, read the Language Specification sections
on [[/ref/spec#Semicolons][Semicolons]] and [[/ref/spec#If_statements][If Statements]].

.play flowcontrol/if-and-else.go

* Exercise: Loops and Functions
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