Compilare: user.cpp: In function ‘int main()’: user.cpp:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:37: warning: ‘b.punct::z’ may be used uninitialized in this function user.cpp:37: warning: ‘b.punct::y’ may be used uninitialized in this function user.cpp:37: warning: ‘b.punct::x’ may be used uninitialized in this function