Question

How to implement a cumulative sum of numbers in an int array with Swift

Answer 1

import Foundation

class CumulativeSumOfIntArray_Swift {
    static func cumulativeSumOfIntArray(_ arr: [Int]) -> [Int] {
        var sumArr = [Int](repeating: 0, count: arr.count)
        var sum = 0
        
        for i in 0..<arr.count {
            sum += arr[i]
            sumArr[i] = sum
        }
        
        return sumArr
    }
    
    static func main() {
        // 0 : 0+1=1 : 0+1+2=3 : 0+1+2+3=6 : 0+1+2+3+4=10 : 0+1+2+3+4+5=15 ...
        let arr = [0, 1, 2, 3, 4, 5, 6]
        
        let sumArr = cumulativeSumOfIntArray(arr)
        
        for sum in sumArr {
            print(sum, terminator: " ")
        }
    }
}

CumulativeSumOfIntArray_Swift.main()



/*
run:

0 1 3 6 10 15 21 

*/

 

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