code added

prim.c

+#include <stdio.h>
+#include <stdbool.h>
+#define typ unsigned long long
+
+
+bool is_it_a_prim(typ* x){
+int k = 2;
+while(k < *x){
+if(*x % k == 0)
+return false;
+k++;
+}
+return true;
+}
+
+
+int main(void){
+typ int fn = 0, fn_1 = 1, fn_2 = 0;
+for(int i=0;i<700;i++)
+{
+fn = fn_1 + fn_2;
+if(is_it_a_prim(&fn))
+printf("%llu\n",fn);
+fn_2 = fn_1;
+fn_1 = fn;
+}
+getchar();
+return 0;
+}