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you may need declare bool func() first before main and func().

like this: bool func();

Thanks for your reply.

I tried many time for use # around my code but it did not work.

I try to compile this piece of code but i got error like this: error: ‘UNIT_MAX’ undeclared (first use in this function)

my code:

#include<stdio.h>
#include<limits.h> /*for UNIT_MAX*/


...

It's working fine now.
Many many many thanks.

The programme should ask user how many primes does he wants and print out the counts and primes.

My code is:


#include <stdio.h>
#include<stdlib.h>

int is_prime(int n);