Answer Posted / naman patidar

we can reduce no of iterations by changing the condition
(i<=n/2) with (i<=sqrt(n))..
This is a rule that if a number is not dividable by any no
(except 1)less than equal to the sqr root of it then the no
is prime.

int n ; // any no, user input.
int i ;
for(i=2; i<=sqrt(n); i++ )
{
if(n%i==0)
{
printf("not prime");
break;
}
}
if(i > sqrt(n)) // you can use a flag as well here
{
printf("prime no");
}

What is the purpose of the following code? Is there any problem with the code? void send(int count, short *to, short *from) { /* count > 0 assumed */ register n = (count + 7) / 8; switch (count % 8) { case 0: do { *to = *from++; case 7: *to = *from++; case 6: *to = *from++; case 5: *to = *from++; case 4: *to = *from++; case 3: *to = *from++; case 2: *to = *from++; case 1: *to = *from++; } while (--n > 0); } }

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