/* The fuel tank program taken from the ihypress.net Web site */

#include <stdio.h>
#define CAPACITY 5000 /* fuel tank capacity (liters) */

int
main (void)
{
   double supply, pumped; /* all in liters */
 
   /* ask user for initial supply already in tank */
   printf ("Enter the the initial supply: ");
   scanf ("%lf", &supply);
 
   /* the program loops until supply falls below 10% */
   while (supply > CAPACITY * 0.10)
   {
       /* ask user for quantity removed or delivered */
       printf ("\nEnter the amount delivered(+)/removed(-): ");
       scanf ("%lf", &pumped);
       supply = supply + pumped;
       
       /* test so that you don't pump more when tank is empty */
       if (supply < 0.0)
          supply = 0.0;
               
       /* test so that you don't fill more when tank is full */
       if (supply > CAPACITY)
          supply = CAPACITY;
    }

       printf ("\nSupply below 10%% (%.2lf l remaining)\n", supply);

       return (0);
}

/* 
Enter the the initial supply: 2000

Enter the amount delivered(+)/removed(-): -900

Enter the amount delivered(+)/removed(-): 1100

Enter the amount delivered(+)/removed(-): -1400

Enter the amount delivered(+)/removed(-): -200

Enter the amount delivered(+)/removed(-): -250

Supply below 10% (350.00 l remaining)

*/