Compilare: user.cpp: In function ‘int main()’: user.cpp:51:5: warning: variable ‘n’ set but not used [-Wunused-but-set-variable] int n,sum=0; ^ user.cpp: In function ‘int feval()’: user.cpp:47:24: warning: control reaches end of non-void function [-Wreturn-type] return v[(cnt+1)/2-1];}} ^ user.cpp: In function ‘int main()’: user.cpp:49:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie2.in","r",stdin); ^ user.cpp:50:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie2.out","w",stdout); ^ user.cpp:52:25: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(ch+1,100003,stdin); ^