Compilare: user.cpp: In function ‘void back(char, char, char)’: user.cpp:21: warning: array subscript has type ‘char’ user.cpp:41: warning: array subscript has type ‘char’ user.cpp:41: warning: array subscript has type ‘char’ user.cpp:41: warning: array subscript has type ‘char’ user.cpp:41: warning: array subscript has type ‘char’ user.cpp:42: warning: array subscript has type ‘char’ user.cpp:42: warning: array subscript has type ‘char’ user.cpp:44: warning: array subscript has type ‘char’ user.cpp:44: warning: array subscript has type ‘char’ user.cpp:45: warning: array subscript has type ‘char’ user.cpp:45: warning: array subscript has type ‘char’ user.cpp:46: warning: array subscript has type ‘char’ user.cpp:46: warning: array subscript has type ‘char’ user.cpp:46: warning: array subscript has type ‘char’ user.cpp:49: warning: array subscript has type ‘char’ user.cpp:49: warning: array subscript has type ‘char’ user.cpp:50: warning: array subscript has type ‘char’ user.cpp:50: warning: array subscript has type ‘char’ user.cpp: In function ‘int main()’: user.cpp:73: warning: comparison between signed and unsigned integer expressions user.cpp:93: warning: array subscript has type ‘char’ user.cpp:93: warning: array subscript has type ‘char’ user.cpp:106: warning: array subscript has type ‘char’ user.cpp:106: warning: array subscript has type ‘char’ user.cpp:107: warning: array subscript has type ‘char’ user.cpp:107: warning: array subscript has type ‘char’ user.cpp:112: warning: comparison between signed and unsigned integer expressions user.cpp:55: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:56: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, 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:63: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result