Question

Drivers are concerned with the mileage obtained by their automobiles. One driver has kept track of several tanks of gasoline by recording miles driven and gallons used for each tank. Develop a program using a while loop that will input the miles driven and the gallons used for each tank. The program should calculate and display the miles per gallon obtained for each tank. After processing all input information, the program should calculate and print the overall miles per gallon obtained for all tanks.  

Answer 1

#include <stdio.h>

int main() {
   double total = 0, count = 0, miles_driven, gallons, miles_per_gallon;
   while(1) {
      printf("Enter number of miles driven(-1 to exit): ");
      scanf("%lf", &miles_driven);
      if(miles_driven < 0) {
         break;
      }
      printf("Enter gallons used for tank: ");
      scanf("%lf", &gallons);
      miles_per_gallon = miles_driven / gallons;
      printf("Miles per gallon is %lf\n\n", miles_per_gallon);
      total += miles_per_gallon;
      count += 1;
   }
   printf("\nOverall miles per gallon is %lf\n", total/count);
   return 0;
}

Enter number of miles driven -1 to exit): 100 nter gallons used for tank: 10 Miles per gallon is 10.000000 Enter number of miles driven〈-1 to exit): 50 nter gallons used for tank:20 Miles per gallon is 2.500000 nter number of miles drivenK-1 to exit>: 50 nter gallons used for tank: 5 Miles per gallon is 10.000000 Enter number of miles driven〈-1 to exit): -1 Overall miles per gallon is 7.500000 Process exited after 16.76 seconds with returnvalue 0 Press any key to continue - - -