Compilare: user.cpp: In function ‘int main()’: user.cpp:31: warning: array subscript has type ‘char’ user.cpp:35: warning: array subscript has type ‘char’ user.cpp:39: warning: array subscript has type ‘char’ user.cpp:42: warning: unused variable ‘i’ user.cpp:42: warning: unused variable ‘j’ user.cpp:24: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:25: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result