Compilare: main.c:29:15: warning: conflicting types for built-in function 'pow'; expected 'double(double, double)' [-Wbuiltin-declaration-mismatch] 29 | long long int pow(int n) | ^~~ main.c:2:1: note: 'pow' is declared in header '<math.h>' 1 | #include <stdio.h> +++ |+#include <math.h> 2 | main.c: In function 'main': main.c:46:17: warning: variable 'f2' set but not used [-Wunused-but-set-variable] 46 | FILE *f1 , *f2; | ^~ main.c:46:11: warning: variable 'f1' set but not used [-Wunused-but-set-variable] 46 | FILE *f1 , *f2; | ^~