now signed and xx th fibonacci´number

prim.c

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