Prata Chapter 5 exs 9

#include <stdio.h>

int main()

{
    float f;
    int counter = 0; //just to break cycle, that became endless, once 'q' is entered
    scanf("%f",&f);

    while( f!= (float)'q')//that's where problem is!
    {
        printf("f is %f\n",f);
        scanf("%f",&f);
        counter++;
        if(counter==5)
            break;

    }

    return 0;
}