View Compilation Error

0_0_27070269_28600.cpp: In function 'int main()':
0_0_27070269_28600.cpp:5:21: error: expected ')' before '!' token
 while(scanf("%f",&a)!EOF)
                     ^
0_0_27070269_28600.cpp:5:25: error: expected ';' before ')' token
 while(scanf("%f",&a)!EOF)
                         ^