Ebook Chapter 5 Problem Solving and Program Design in C

• 5.5 Figure 5.9 Program to Monitor Gasoline Storage Tank

 #include <cstdlib>
#include <iostream>
#define capacity 80000.0
#define min_pct 10
#define gals_per_brl 42.0

double monitor_gas(double min_supplay,double start_supply);

using namespace std;

int main(void)
{
    double start_supply, min_supply, current;
    min_supply = min_pct/100.0*capacity;
    cout<<"Number of barrels currently in tank> ";
    cin>>start_supply;
  
    current = monitor_gas(min_supply,start_supply);
    cout<<"only barrels are left."<<current<<endl<<endl;
    cout<<"*** WARNING ***"<<endl;
    cout<<"Available supply is less than percent of"<<min_pct<<"tank's "<<endl;
    cout<<capacity<<"barrel capacity."<<endl;
  

  
    system("PAUSE");
    return EXIT_SUCCESS;
}

double monitor_gas(double min_supply, double start_supply)
{
       double remov_gals, remov_brls,current;
              for (current = start_supply; current >= min_supply; current -= remov_brls){
                  cout<<"barrels are available."<<current<<endl<<endl;
                  cout<<"Enter number of gallons removed> ";
                  cin>>remov_gals;
                  remov_brls = remov_gals/gals_per_brl;
                
                  cout<<"After removal of"<<remov_gals<<" gallone {"<<remov_brls<<" barrels)"<<endl;
                  }
                 return (current);
                 }
               
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