View Compilation Error

0_0_31064698_30708.cpp: In function 'int main()':
0_0_31064698_30708.cpp:6:48: error: expected ')' before '!' token
     while(scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2)!EOF);
                                                ^
0_0_31064698_30708.cpp:6:52: error: expected ';' before ')' token
     while(scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2)!EOF);
                                                    ^
0_0_31064698_30708.cpp:9:16: error: 'pow' was not declared in this scope
     d=pow(d,0.5);
                ^