How to make all possible sum combinations from array elements in VB

Question

If there is an array with elements: 1,2,3,4, the program should return another array with sum of all combinations:

1
2
3
4
3 (1+2)
4 (1+3) 
5 (1+4)
5 (2+3)
6 (2+4)
7 (         


        

Answer 1

My idea is:

(pseudcode, I don;t know VB)

for(int i = 0; i < 4321; i++)
{
    i mod 10 + // first from right digit
    (int)((i mod 100)mod 10) // second, (?)
    // etc
    // sum up all 4 digit
    // add to array  
}