Compilare: user.cpp: In function ‘int add(int, int)’: user.cpp:48:14: warning: no return statement in function returning non-void [-Wreturn-type] aux->num=poz;} ^ user.cpp: In function ‘int calc(int)’: user.cpp:64:16: warning: no return statement in function returning non-void [-Wreturn-type] start=aux->num;} ^ user.cpp: In function ‘char nextc()’: user.cpp:11:26: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,buffs,stdin); ^ user.cpp: In function ‘int main()’: user.cpp:66:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xormax.in","r",stdin); ^ user.cpp:67:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xormax.out","w",stdout); ^ user.cpp:69:26: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,buffs,stdin); ^