variable name from string in obj-c

I have a bunch of variables named index1, index2, ..., indexn. I want to calculate i = array[index1] + array[index2] + ... + array[indexn]. I heard that I can d开发者_StackOverflow社区o that in a loop, getting the current variable name from the loop index. How can I do that?

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Instead of having individual variables like this:

int index1, index2, index3, ...indexN:

you should consider using an array of indices:

int index[N];

and then you can sum in a loop, e.g.

sum = 0;
for (i = 0; i < N; ++i)
{
    sum += array[index[i]];
}

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Sorry, this is not possible in objective-c. It works for example in php.

There are ways to get objects by name if your data model allows for this, but in general variable names cannot be synthesized by name.