Compilare: user.c: In function ‘main’: user.c:13:1: warning: format ‘%lld’ expects argument of type ‘long long int *’, but argument 3 has type ‘int *’ [-Wformat=] fscanf(file1, "%lld", &N); ^ user.c:21:5: warning: implicit declaration of function ‘pow’ [-Wimplicit-function-declaration] fprintf(file2, "%.7lf", pow(5.0/6.0, n-4) * 277.0/54 + 6 - 6 * pow(5.0/6.0, n)); ^ user.c:21:29: warning: incompatible implicit declaration of built-in function ‘pow’ [enabled by default] fprintf(file2, "%.7lf", pow(5.0/6.0, n-4) * 277.0/54 + 6 - 6 * pow(5.0/6.0, n)); ^ user.c:13:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lld", &N); ^