> Here is an odd bit of C code....
> Do you think it is legit ?

yes, why not?

>     switch  (n)
>         default::
>             if (isprime(n))
>                 case 2: case 3: case 5: case 7: p = 1;
>             else
>                 case 4: case 6: case 8 case 9: : p=0;
> 
> If it is, what on earth does it do?

compute whether n is prime

> (and why!)

it speeds up the prime-check for < 10, and defers the check for >= 10 to
isprime(), without using extra 'return' statements. This makes sense
only if the objective is to minimise the number of return statements.


Wouter van Ooijen

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