View Compilation Error

0_0_27176243_28547.cpp: In function 'int main()':
0_0_27176243_28547.cpp:9:47: error: expected ')' before '!' token
     while(scanf("%d %d %d %d",&x1,&y1,&x2,&y2)!EOF)
                                               ^
0_0_27176243_28547.cpp:9:51: error: expected ';' before ')' token
     while(scanf("%d %d %d %d",&x1,&y1,&x2,&y2)!EOF)
                                                   ^