Compilare: user.cpp: In function ‘int main()’: user.cpp:74:13: warning: unused variable ‘z’ [-Wunused-variable] int z=!op.empty(); ^ user.cpp:40:14: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] int n,nr,x; ^ user.cpp:41:10: warning: variable ‘y’ set but not used [-Wunused-but-set-variable] char y; ^ user.cpp:38:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.in","r",stdin); ^ user.cpp:39:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.out","w",stdout); ^ user.cpp:42:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp: In function ‘int priority(char)’: user.cpp:19:12: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] return p; ^ user.cpp: In function ‘int main()’: user.cpp:85:44: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(!op.empty() && op.top()!='(' && priority(s[i])<=priority(op.top())) ^ /tmp/ccQp67ub.o: In function `main': user.cpp:(.text.startup+0x5b): warning: the `gets' function is dangerous and should not be used.