Telefonos cucc (switch, case alapok)

#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);
            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;
}