added the right limit

prim.c

 #include <limits.h>
 #define typ long long int
 
-
-bool is_it_a_prim(typ* x){
+bool foo(typ* x){
 int k = 2;
 while(k < *x){
 if(*x % k == 0)
 return true;
 }
 
-
 int main(void){
 typ fn = 0, fn_1 = 1, fn_2 = 0;
-int i = 2;
-while(fn < LLONG_MAX)
+
+printf("%llu",ULONG_MAX);
+
+while(fn < ULONG_MAX)
 {
-fn = fn_1 + fn_2;
-if(is_it_a_prim(&fn))
-printf("%d\t%llu\n",i ,fn);
+fn = (typ)fn_1 + (typ)fn_2;
+if(foo(&fn))
+printf("%llu\n",fn);
 fn_2 = fn_1;
 fn_1 = fn;
-i++;
 }
 return 0;
 }