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Hello,
I am having a problem with the precision of some of my calculations. The example below is about calculating a field called basicAdjustedSalary.
BasicAdjustedSalary = 1.06*currentSalary + 2550.00 * age + (yrsOnteam/yrsInLg) *145924.75
Here is a quick example of the issue I am seeing
Current Salary = 4253628.5
Salary Multi = 1.06
Salary Multi * Curr Salary = 4508846.0
*** Incorrect should be 4508846.21
I have all the fields involved defined as float type. I don’t understand why I am not getting the correct result.
Thanks,
Paul
I don’t know if it will be helpful, but here is the code section and the output from the println statements:
** OUTPUT **
Current Salary = 4253628.5
Salary Multi = 1.06
Salary Multi * Curr Salary = 4508846.0
*** Incorrect should be 4508846.21
Age = 34
Age Multi= 2550.0
Age Multi * Age = 86700.0
*** Correct
Yrs on Team / Years in Lg = 0.6666667
Loyalty Multi = 145924.75
(Yrs on Team / Years in Lg) * Loy multi = 97283.17
*** Correct
Basic Adjusted = 4692829.0
*** Incorrect should be 4692829.38
*** CODE ***
//*************************
//Name: calcBasicAdjustedSalary
//Purpose: calculate the basic adjusted salary
//Accepts: void
//Returns: float value representing the basicAdjustedSalary
//*************************
public void calcBasicAdjustedSalary()
{
//Use constants defined in the BaseballTeam class to calculate the
// appropriate value
basicAdjustedSalary = (BaseballTeam.SALARY_MULTI * currentSalary) +
(BaseballTeam.AGE_MULTI * age) + (((float)yearsOnTeam/yearsInLeague) * BaseballTeam.LOYALTY_MULTI);
System.out.println("\nCurrent Salary = " + currentSalary);
System.out.println("Salary Multi = " + BaseballTeam.SALARY_MULTI);
System.out.println("Salary Multi * Curr Salary = " +
BaseballTeam.SALARY_MULTI * currentSalary );
System.out.println("*** Incorrect should be 4508846.21\n");
System.out.println("Age = " + age);
System.out.println("Age Multi = " + BaseballTeam.AGE_MULTI);
System.out.println("Age Multi * Age = " +
(BaseballTeam.AGE_MULTI * age));
System.out.println("*** Correct\n");
System.out.println("Yrs on Team / Years in Lg = " +
((float)yearsOnTeam/yearsInLeague) );
System.out.println("Loyalty Multi = " + BaseballTeam.LOYALTY_MULTI);
System.out.println("(Yrs on Team / Years in Lg) * Loy multi = " +
(((float)yearsOnTeam/yearsInLeague) *BaseballTeam.LOYALTY_MULTI) );
System.out.println("*** Correct\n");
System.out.println("\nBasic Adjusted = " + basicAdjustedSalary);
System.out.println("*** Incorrect should be 4692829.38\n");
}
PC
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The float type is a single-precision floating point number, you are getting the normal precision (about 7 decimal digits) to be expected from single precision calculations. Use the double type if you need more precision, but note that floating point is never absolutely accurate.
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Malcolm McMahon wrote:
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