How to print the sum of NSMutableArray

Question

i cannot find the way to print the sum of all the numbers between 0 to 100 in a new line in the console. Here is my code:

NSMutableArray *intArray = [[NSMutableArray alloc] initWithCapacity:100];
    for (int i = 1 ; i <= 100 ; i ++)
        [intArray addObject:[NSNumber numberWithInt:i]];
        NSLog(@"%@", intArray);

Simon Whitaker · Answer 1 · 2011-12-11T18:59:57.377

3

I'm not sure why you're even using an array here. To sum the numbers between 1 and 100 just loop through that range adding the current number to a total, then print the total out.

    int total = 0;
    for (int i = 1; i <= 100; i++) {
        total += i;
    }
    NSLog(@"%i", total);

edited Dec 11 '11 at 18:59

answered Dec 11 '11 at 18:49

Simon Whitaker

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score 2 · Accepted Answer · answered Dec 11 '11 at 19:11

2

You want to print the sum of all the integers from 1 to 100? How about:

NSLog(@"5050");

answered Dec 11 '11 at 19:11

Dave DeLong

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DarkDust What does your comment mean? – John Riselvato Jun 15 '12 at 17:06
1

@JohnRiselvato there's an anecdote about Gauss computing this sum very quickly: http://en.wikipedia.org/wiki/Carl_Friedrich_Gauss#Anecdotes – Dave DeLong Jun 16 '12 at 02:48

How to print the sum of NSMutableArray

2 Answers2