View Compilation Error

0_0_26338273_6234.cpp: In function 'int main()':
0_0_26338273_6234.cpp:6:52: error: expected primary-expression before ')' token
 while (scanf("%lf%lf%lf %lf",&x1,&x2,&y1,&y2)!=EOF))
                                                    ^
0_0_26338273_6234.cpp:13:1: error: expected ';' before '}' token
 }
 ^