Compilare: user.cpp: In function ‘float aria(int)’: user.cpp:103: warning: unused variable ‘xb’ user.cpp:103: warning: unused variable ‘yb’ user.cpp: In function ‘int main()’: user.cpp:180: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:149: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:150: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:152: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:156: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘float aria(int)’: user.cpp:103: warning: ‘yc’ may be used uninitialized in this function user.cpp:103: warning: ‘yd’ may be used uninitialized in this function user.cpp:103: warning: ‘xc’ may be used uninitialized in this function user.cpp:103: warning: ‘xd’ may be used uninitialized in this function