Enum használata

#include <stdio.h>
#include <stdlib.h>

int main(void){
        int N;
        int i;
        int tipus;
        double ido;
        double sum_kf;
        double sum_hk;
        double sum_hb;

        enum tip{
                KULFOLDI = 1,
                HALOZATON_KIVULI,
                HALOZATON_BELULI
        };
        sum_kf = sum_hk = sum_hb = 0;
        printf("Hany adat lesz? ");
        scanf("%d", &N);
        i=1;
        while(i<=N){
            printf("%d. hivas adatai: \n", i);
            printf("Tipus [1-kulfoldi, 2-halozaton kivuli, 3-halozaton beluli]: ");
            scanf("%d", &tipus);
            printf("Beszelgetes ideje (percben): ");
            scanf("%lf", &ido);
            if (1==tipus)
                    sum_kf=sum_kf+(ido*100);
            else
            {
                    if (2==tipus)
                            sum_hk=sum_hk+(ido*60);
                    else
                    {
                            if (3==tipus)
                                    sum_hb = sum_hb + (ido*40);
                            else
                                    printf("Nem definiált tipus!");
                    }
            }
    /*
            if (1==tipus)
            {
                    sum_kf=sum_kf+(ido*100);
            }
            else if (2==tipus)
            {
                    sum_hk=sum_hk+(ido*60);
            }
            else if (3==tipus)
            {
                    sum_hb=sum_hb+(ido*40);
            }
            else
                    printf("Nem definialt tipus!");
    */
    /*
            switch (tipus)
            {
                    case 1:
                            sum_kf=sum_kf+(ido*100);
                            break;

                    case 2:
                            sum_hk=sum_hk+(ido*60);
                            break;

                    case 3:
                            sum_hb=sum_hb+(ido*40);
                            break;

                    default:
                            printf("Nem definialt tipus!");
            }
    */
            switch (tipus)
            {
                    case KULFOLDI:
                            sum_kf=sum_kf + (ido*100);
                            break;

                    case HALOZATON_KIVULI:
                            sum_hk=sum_hk + (ido*60);
                            break;

                    case HALOZATON_BELULI:
                            sum_hb=sum_hb + (ido*40);
                            break;

                    default:
                            printf("Nem definialt tipus!");
            }
            i++;
    }
    printf("\nA szamla vegoszege: %.2lf (1) + %.2lf (2) + %.2lf (3) = %.2lf Ft\n", sum_kf, sum_hk, sum_hb, sum_kf + sum_hk + sum_hb);
    return 0;
}