Compilare: user.cpp: In function ‘int main()’: user.cpp:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘long long int pow(long long int, long long int, long long int)’: user.cpp:11: warning: ‘r’ may be used uninitialized in this function