Compilare: user.cpp: In function ‘int main()’: user.cpp:60: warning: suggest parentheses around comparison in operand of ‘^’ user.cpp:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:44: warning: ‘st’ may be used uninitialized in this function user.cpp:44: warning: ‘dr’ may be used uninitialized in this function