Compilare: user.cpp: In function ‘int main()’: user.cpp:9: warning: unused variable ‘xv’ user.cpp:9: warning: unused variable ‘yv’ user.cpp:9: warning: unused variable ‘t’ user.cpp:10: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:13: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:14: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:18: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:9: warning: ‘x1’ may be used uninitialized in this function user.cpp:9: warning: ‘y1’ may be used uninitialized in this function