Compilare: user.cpp:11: warning: ISO C++ forbids declaration of ‘main’ with no type user.cpp: In function ‘int main()’: user.cpp:15: warning: format ‘%u’ expects type ‘unsigned int*’, but argument 2 has type ‘long unsigned int*’ user.cpp:15: warning: format ‘%u’ expects type ‘unsigned int*’, but argument 3 has type ‘long unsigned int*’ user.cpp:31: warning: format ‘%u’ expects type ‘unsigned int’, but argument 2 has type ‘long unsigned int’ user.cpp:12: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:13: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result