Compilare: user.cpp: In function ‘int back(int, int, int)’: user.cpp:30: warning: name lookup of ‘r’ changed user.cpp:15: warning: matches this ‘r’ under ISO standard rules user.cpp:25: warning: matches this ‘r’ under old rules user.cpp:38: warning: no return statement in function returning non-void user.cpp: In function ‘int main()’: user.cpp:46: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:51: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int niveluri(int)’: user.cpp:12: warning: control reaches end of non-void function