Compilare: user.cpp: In function ‘int main()’: user.cpp:96:12: warning: statement has no effect [-Wunused-value] for(top;top>=1;top--) ^ user.cpp:25:10: warning: variable ‘ch’ set but not used [-Wunused-but-set-variable] char ch; ^ user.cpp:22:37: 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:23:39: 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:26:12: 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:14:12: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] return p; ^ user.cpp: In function ‘int main()’: user.cpp:72:38: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(top>0&&op[top]!='('&&priority(s[i])<=priority(op[top])) ^ user.cpp:68:36: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(top==0||op[top]=='('||priority(s[i])>priority(op[top])) ^ /tmp/ccaP7Z1B.o: In function `main': user.cpp:(.text.startup+0x56): warning: the `gets' function is dangerous and should not be used.