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Page Affected: https://developers.google.com/web/TODO

What needs to be done?

The web page https://developers.google.com/web/updates/2018/03/emscripting-a-c-library is an excellent example of using Emscripten but the example Fibonacci program on the page is incorrect. Instead of returning Fib(n), it returns Fib(n+1). For example, Fib(5) = 5, but the supplied function returns 8. See http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/fibtable.html for an authoritative list of Fibonacci numbers.

This does not affect the value of the page, but is disconcerting to math-ocd people :-).

The problem can be fixed in many ways, but I fixed it like this:

include

EMSCRIPTEN_KEEPALIVE int fib(int n) { int i, t, a = 0, b = 1;

if (n <= 0) { return 0; }

for (i = 1; i < n; i++) { t = a + b; a = b; b = t; } return b; }

[ ] Appropriate type-something label has been added.
[ ] Appropriate section-something label has been added.

google / WebFundamentals

Fibonacci formula is incorrect #7634

The problem can be fixed in many ways, but I fixed it like this:

include

for (i = 1; i < n; i++) { t = a + b; a = b; b = t; } return b; }