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Why doesn't it let me do add/substract array values?

Haraakesh Kumar

Why does doing:

map[0,0]-map[0,1]

on a mutidimensional integer array gives me an error:

Object reference not set to an instance of an object.

instead of substracting the actual values?

1 Reply

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Vulpes13y ago
It sounds like you haven't actually created a two dimensional integer array object:

int[,] map = new int[2,2];
map[0,0] = 4;
map[0,1] = 3;
map[1,0] = 2;
map[1,1] = 1;
int diff = map[0,0] - map[0,1];
Console.WriteLine(diff); // 1