On Feb 16, 2005, at 11:26 PM, Wouter van Ooijen wrote:

>
>>     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;
>>
>>
I am SO glad that these days one can trust a compiler to generate
equivalently efficient code from:
	switch(n) {
	   case 2: case 3: case 5: case 7:
		  p = 1;
	      break;
	   case 4: case 6: case 8: case 7:
	      p = 0;
		  break;
        default:
		   if (isprime(n))
			  p = 1;
		   else
			  p = 0;
       }

Although the default case in both cases is improved with;
	p = isprime(n)

BillW
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