Compilare: user.cpp: In function ‘void read()’: user.cpp:31: warning: format ‘%d’ expects type ‘int*’, but argument 4 has type ‘int’ user.cpp:27: warning: unused variable ‘x1’ user.cpp:27: warning: unused variable ‘y1’ user.cpp:27: warning: unused variable ‘x2’ user.cpp:27: warning: unused variable ‘y2’ user.cpp:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result 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