4-8

#include<stdio.h>
#include<string.h>
#define GALLON_PER 3.785
#define MILEAGE_PER 1.609
int main(void)
{
float mileage,petrol_consumption,mileage_per_gallon,mileage_per_gallon_c;
printf("plese input you mileage(Miles) and petrol_consumption(gallon):\n ");
scanf("%f %f",&mileage,&petrol_consumption);
mileage_per_gallon = mileage/petrol_consumption;
printf("%.1f\n",mileage_per_gallon);
mileage_per_gallon_c=petrol_consumption*GALLON_PER*100/(mileage*MILEAGE_PER);
printf("%.1f\n",mileage_per_gallon_c);

return 0;
}