Modify the following C++ program so that it uses two value-returning functions;

Question

Modify the following C++ program so that it uses two value-returning functions; one to determine the fat calories and the other to determine the fate percentage.

#include <iostream>

#include <iomanip>

using namespace std;

int main ()

{

               //declare variables

               Int totalCals = 0;

               Int fatGrams = 0;

               Int fatCals = 0;

               Double fatPerecent = 0.0;

               //enter input items

               cout << “Total calories: “;

               cin >> totalCals;

               cout<<”Grams of fat:”;

               cin>>fatGrams;

               //determine whether data is valid

               If (totalCals >= 0 && fatGrams >= 0)

               {

                              //calculate and display the output

                              fatCals = fatGrams*9;

                              fatPercent = static_cast<double>(fatCals)

                                             / static_cast<double>(totalCals)*100;

                              cout << “Fat calories:” << fatCals<<endl;

                              cout << fixed<<setprecision(0);

                              cout << “Fat percentage: “<<fatPercent

                                             <<%<<endl;

               }

else

               cout<<”Input erroer”<<endl;

//end if

system (“pause”);

return 0;

} //end of main function

Explanation / Answer

#include <iostream>
#include <cmath>
#include <iomanip>

using namespace std;

//function prototype
int getFatCals(int);
double getFatPercent(int, int);

int main()
{
   //declare variables
       int totalCals = 0;
       int fatGrams = 0;
       int fatCals = 0;
       double fatPercent = 0.0;

   //get input items
   cout << "Total Calories: ";
   cin >> totalCals;
   cout << "Grams of fat: ";
   cin >> fatGrams;
  
if (totalCals >= 0 && fatGrams >= 0)
{
   //call function to Fat calories and fat Percentage
   fatCals = getFatCals(fatGrams);
   fatPercent = getFatPercent(fatCals, totalCals);

   //display
cout << fixed << setprecision(2) << endl;
cout << "Fat Calories: " << fatCals << endl;
cout << "Fat Percent: " << fatPercent << endl;
}
else
{
cout<<"Input erroer"<<endl;
}
//end if
system("pause");
return 0;
} //end of main function

//*****function definitions*****
int getFatCals(int fatGram)
{
   //calculates and returns fat grams
   int getFatCals = 0;
   getFatCals = fatGram * 9;
   return getFatCals;
} //end of getFatCals function

double getFatPercent(int fatCal, int totalCal)
{
   //calculates and returns fat percent
   double getFatPercent = 0.0;
   getFatPercent = static_cast<double>(fatCal)/ static_cast<double>(totalCal) * 100;
   return getFatPercent;
} //end of getFatPercent function

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