HOw will i make a 5 X 5 2D array w/ diagonal sum.

[aLLtimeLOW]

5 X 5 Two dimensional integer array in the main function and its diagonal sum.should i use 3 pre-defined functions?

example like this :



1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20
21 22 23 24 25

sum is = 117

[sammy34]

Here's some example code that will statically create a 2D array of dimensions 5x5. It populates it like your example above, and calculates the sum of the elements on the diagonal (note that this doesn't equal 117).

#include <iostream>
#include <string>

using namespace std;
int main()
{
	int myArray[5][5];

	// Populate array
	for(int i=0; i<5; i++)
	{
		for(int j=0; j<5; j++)
		{
			myArray[i][j] = (i)*5 + (j+1);
		}
	}

	// Calculate sum of elements on diagonal
	int sum = 0;
	for(int i=0; i<5; i++)
	{
		sum += myArray[i][i];
	}

        return 1;
}

[Duthomhas]

Sigh. http://www.cplusplus.com/forum/general/21169/

I'm not sure whether I'm more disappointed with the OP or with the blithe answer. What ever happened to figuring stuff out for yourself?

[sammy34]

... disappointed with ... the blithe answer.

Hmmmm....I don't get it. Did I misinterpret something or write something incorrectly? If so, please let me know!

[sammy34]

Ahhhh ok, he wanted the sum of both diagonals, not just the main diagonal in a matrix (maths). My bad...

[Duthomhas]

No, you should help people learn stuff for themselves instead of just giving answers.