Compilare: user.cpp: In function ‘double mul(double (*)[24], double (*)[24], double (*)[24])’: user.cpp:25:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:92:24: warning: unused variable ‘p4’ [-Wunused-variable] double p1, p2, p3, p4; ^ user.cpp:94:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("hprob.out", "w", stdout); ^