Objective-C adding values of 2 arrays - objective-c

Question

I have NSArray1 = (1, 5, 2)
and NSArray2 = (1, 3, 5)
i want to array1 + array2 = (should return) = (2, 8, 7)
(in fact is it even possible to do this with NSArray)?
Heres a similar question
Adding two arrays together
(but this adds the values of the second array onto the end of the first array)
NSArray *a = [NSArray arrayWithObjects: #"1" ,#"2",#"3",nil];
NSArray *b = [NSArray arrayWithObjects: #"1" ,#"2",#"3",nil];
NSMutableArray *c = [[NSMutableArray alloc]init];
c = [a addObjectsFromArray:b];
// just a test code . . . .

Answer 1

If it's a C array, then just do
int newArray[3];
for (int i=0;i<3;i++)
newArray[i] = array1[i]+array2[i];
But if it's a NSArray with NSNumbers (You can't have primitives in NSArray), then just do
NSMutableArray *newArray = [NSMutableArray array];
for (int i=0;i<[array1 count];i++)
[newArray addObject:[NSNumber numberWithInt:[[array1 objectAtIndex:i] intValue]+[[array2 objectAtIndex:i] intValue]]];
//If you're using Mountain Lion, then you can use the following
//[newArray addObject:#([array1[i] intValue]+[array2[i] intValue])];
Edit:
If you have more than 1 array, then
int numArrays = 3;
NSArray *arrayOfNum = //An array of arrays that contains all the numbers
NSMutableArray *newArray = [NSMutableArray array]
for (int i=0;i<[array1 count];i++)
{
int total = 0;
for (int x=0;x<numArrays;x++)
total+=[arrayOfNum[x] intValue];
[newArray addObject:#(total)];
}