Compilare: user.cpp: In function ‘void mul(int (*)[3], int (*)[3])’: user.cpp:13: warning: unused variable ‘i’ user.cpp:13: warning: unused variable ‘j’ user.cpp:13: warning: unused variable ‘k’ user.cpp: In function ‘int main()’: user.cpp:27: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result