#include <stdio.h>
#include <stdlib.h>
#define rate 0.50
float calulatecharges(float hour);
int main(void){
        int car=0;
        float hour=0.0;
        while(hour!=-1){
                car ++;
                printf("\nhour: ");
                scanf("%f",&hour);
                printf("Macchina n.\tore\tcosto\n%d\t%f\t%f",car,hour,calulatecharges(hour));

        }
}
float calulatecharges(float hour){
        float tot=0;
        if(hour>3){
                tot=((hour -3)*rate)+2;
                return tot;
        }else{
                tot=2.0;
                return tot;
        }
}