Compilare: user.cpp: In function ‘long long unsigned int Power(long long unsigned int, long long unsigned int)’: user.cpp:19:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= b; i++) ^ user.cpp: In function ‘int main()’: user.cpp:111:24: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets (s, MAX, fin); ^