Suggestions for Double Declining Depreciation?

[DaRok28]

 #include <iostream> 
using namespace std;
 
int main()
{
int i, iYears;
float fInitialVal, fSalvageVal;
char cAgain;
 
do
{
     cout << endl << "Please enter an initial value: ";
     cin >> fInitialVal;
     cout << endl << "Please enter a salvage value: ";
     cin >> fSalvageVal;
     cout << endl << "Please enter the number of years to depreciate: ";
     cin >> iYears;
 
cout << endl << endl << "Straight Line" << endl;
cout << endl << "Year Value" << endl;
     for(i = 1; i <= iYears; i++)
     {
fInitialVal = (fInitialVal - fSalvageVal);
cout << endl << i << " " << fInitialVal;
     }
 
     cout << endl << endl << "Double Declining" << endl;
     cout << endl << "Year Value" << endl;
 
     for(i = 1; i <= iYears; i++)
     {
fInitialVal = fInitialVal - fSalvageVal * 2/ iYears;
     cout << endl << i << " " << fInitialVal;
     }
cout << endl << endl << "Would you like to run another"
<< " calculation? Y/y/N/n" << endl << endl;
cin >> cAgain;
}while (cAgain == 'Y' || cAgain == 'y');
 
return 0;
 
}
 
 

Ok, my straight line depreciation works correctly but I am having trouble geting my Double Declining to work. I need it to output the numbers under the Year and value not the math. So if anyone has any suggestion for my code they would be appreciated.


Double declining, initial value 12000, salvage value 2000, 5 years.

year value
0 12000
1 8000 (subtracted (12000 - 2000) * (2/5) )
2 5600 (subtracted (8000 - 2000) * (2/5) )
3 4160 (subtracted (5600 - 2000) * (2/5) )
4 3296 (subtracted (4160 - 2000) * (2/5) )
5 2777.6 (subtracted (3296 - 2000) * (2/5) )

[weaknessforcats]

Looks like a job for recursion to me. Recursion is where a function calls itself.

So, you call:

DDepreciation(12000, 5) this functions calls:
DDepreciation(8000, 4) which calls
DDeopreciation(5600, 3) etc.

when the year is 0 the function returns. Consult a textbook for this.

Also, be careful of using floating point in fincance applications. The automatic rounding can throw your books off. In fact, there a laws in Europe prohibiting floating point in trhese types of applications. I would keep my amounts in pennies. Only when I display would I show 12345 as 123.45 by converting the int to a string where I manually insert the decimal point.