Getting an error while adding a integer to array object at index (objective c)

Question

while adding a integer to object at index of an array, I am getting an error of "arithmetic on pointer to interface id which is not a constant size for this architecture and platform", didn't know how to resolve it. Please help.

my code is -

 if (arrayTotalAmount.count>0) {
                     int sum = 0;
                    for (int i = 0; i<=arrayTotalAmount.count; i++) {
                     sum = (sum+[arrayTotalAmount objectAtIndex:i]);

    }

In 4th line I am getting that error. Thanks

Matic Oblak · Accepted Answer · 2017-10-03 07:05:21Z

2

Objective C array only accepts NSObject type. That means it is impossible to insert a primitive value into an NSArray. You are getting an error because objectAtIndex method returns a pointer which points to that NSObject, the arithmetic operations are still valid on pointers but the thing is that the size of a pointer as integer (32bit, 64bit) may differ on device. So one of the solution is typecasting the pointer sum+(int)[arrayTotalAmount objectAtIndex:i] which makes no sense in your case.

The solution you are looking for is probably sum+[[arrayTotalAmount objectAtIndex:i] intValue] or similar. Assuming that array contains NSNumber objects. If the object inside an array is not an NSNumber then your app will fail in runtime showing an error indicating that an object X does not have a method called intValue in which case you will need to figure how to convert object X to your int.

answered Oct 3, 2017 at 7:05

Matic Oblak

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2 Comments

Harsh Over a year ago

Thanks for your valuable time. I found my answer :)

Matic Oblak Over a year ago

@Harsh It is the same solution as the other answer. But just since you are working with arrays in Objective-C note that instead of objectAtIndex:i you can use [arrayTotalAmount[i] intValue]. But in your case it is better to just turn the loop around and use for(NSNumber *number in arrayTotalAmount) sum += [number intValue];

Chandni · Accepted Answer · 2017-10-03 06:59:35Z

1

You just need to convert your array object to integer and then add it will work for you.

if (arrayTotalAmount.count>0) {
                     int sum = 0;
                    for (int i = 0; i<=arrayTotalAmount.count; i++) {
                     sum = (sum+[[arrayTotalAmount objectAtIndex:i] intValue]);

    }

answered Oct 3, 2017 at 6:59

Chandni

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