Detecting EOF in C

I am using the following C code to take input from user until EOF occurs, but problem is this code is not working, it terminates after taking first input. Can anyone tell me whats wrong with this code. Thanks in advance.

float input;

printf("Input No: ");
scanf("%f", &input);

while(!EOF)
{
    printf("Output: %f", input);
    printf("Input No: ");
    scanf("%f", &input);
}