Compilare: user.cpp: In function ‘void getLine(line&)’: user.cpp:14: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp: In function ‘int main()’: user.cpp:39: warning: unused variable ‘x1’ user.cpp:39: warning: unused variable ‘x2’ user.cpp:39: warning: unused variable ‘y1’ user.cpp:39: warning: unused variable ‘y2’ user.cpp:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result