Compilare: user.cpp: In function ‘int main()’: user.cpp:7: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:11: 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 user.cpp:9: warning: ‘x2’ may be used uninitialized in this function user.cpp:9: warning: ‘y2’ may be used uninitialized in this function user.cpp:9: warning: ‘pr’ may be used uninitialized in this function user.cpp:9: warning: ‘sf’ may be used uninitialized in this function