CODEWITHSUNDEEP
objective-cvariablesdecimal
Niall Kiddle
Niall Kiddle

Reputation: 1487

How to use decimal variable

I am using a For loop to cycle through variables in an array that contain percentages. For each value I run through an equation to give me an average of all the percentages. The only problem is that I am unsure how to change the variable types to accommodate decimals whilst also work in with my equation.

// Calculate average of all percentages for specific exercise
long totalNumber = 0;
int temp;
long numberOfObjects = [iterationArray count];
for (NSArray *object in iterationArray) {
    temp = [(NSNumber *)[object objectAtIndex:4] intValue]/100;
    totalNumber = totalNumber + temp;
}
exercisePercentage = (totalNumber/numberOfObjects)*100;

return exercisePercentage;

I know that temp is the variable that needs to be a decimal. I was considering using an NSDecimalNumber but didn't know how to fit in with the rest of the code to return a long value.

I've tried with making temp a double or float but both return 0 on the line temp = [(NSNumber *)[object objectAtIndex:4] intValue]/100; despite the fact that [(NSNumber *)[object objectAtIndex:4] intValue] is 80.

Upvotes: 1

Views: 359

Answers (2)

Mukesh
Mukesh

Reputation: 2902

Division of int with int always returns int, so you need to convert one value into float or double, something like this:

// Calculate average of all percentages for specific exercise
double totalNumber = 0.0;
double temp;
long numberOfObjects = [iterationArray count];
for (NSArray *object in iterationArray) {
    temp = [(NSNumber *)[object objectAtIndex:4] intValue]/100.0;
    totalNumber = totalNumber + temp;
}
exercisePercentage = (totalNumber/numberOfObjects)*100.0;

return exercisePercentage;

See it's 100.0, now it should work.

Upvotes: 6

Mahesh kumar
Mahesh kumar

Reputation: 278

Please change the type of temp form int to float or double.

double temp;
float temp;

Upvotes: 0

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