Compilare: user.cpp: In function ‘bool correct(int)’: user.cpp:67: warning: unused variable ‘sir’ user.cpp: In function ‘int main()’: user.cpp:186: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:188: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result