Compilare: user.cpp: In function ‘int main()’: user.cpp:91: warning: array subscript has type ‘char’ user.cpp:96: warning: array subscript has type ‘char’ user.cpp:97: warning: array subscript has type ‘char’ user.cpp:109: warning: array subscript has type ‘char’ user.cpp:84: warning: unused variable ‘app’ user.cpp:72: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:74: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:86: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result