Compilare: user.cpp: In function ‘void decoding(int, char*)’: user.cpp:21: warning: array subscript has type ‘char’ user.cpp: In function ‘int coding(char*)’: user.cpp:33: warning: array subscript has type ‘char’ user.cpp:37: warning: array subscript has type ‘char’ user.cpp: In function ‘int main()’: user.cpp:48: warning: suggest parentheses around assignment used as truth value user.cpp:51: warning: array subscript has type ‘char’ user.cpp:54: warning: array subscript has type ‘char’ user.cpp:54: warning: array subscript has type ‘char’ user.cpp:56: warning: array subscript has type ‘char’ user.cpp:56: warning: array subscript has type ‘char’ user.cpp:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:59: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:61: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result