View Compilation Error

0_0_26601789_12219.cpp: In function 'int main()':
0_0_26601789_12219.cpp:5:30: error: expected ')' before '!' token
  while(scanf("%lf %lf",&a,&b)!EOF)
                              ^
0_0_26601789_12219.cpp:5:34: error: expected ';' before ')' token
  while(scanf("%lf %lf",&a,&b)!EOF)
                                  ^