Compilare: user.cpp: In function ‘void citire()’: user.cpp:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void eval()’: user.cpp:56: warning: array subscript has type ‘char’ user.cpp:56: warning: array subscript has type ‘char’ user.cpp: In function ‘void afisare()’: user.cpp:99: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int efectuare(int, int, char)’: user.cpp:31: warning: control reaches end of non-void function