Programming to find the sum of all elements on two diagonal lines of a 4 * 4 matrix

Programming to find the sum of all elements on two diagonal lines of a 4 * 4 matrix

Tested
#include
int main ()
{
\x09int a[4][4],i,j,sum=0;
\x09for(i=0;i

A 5 × 5 matrix with upper right triangle element (including diagonal) 1 and other elements 0 is designed by VB program

Dim a(5,5)
Private Sub Command1_ Click()
'right, inverted triangle
For i = 0 To 4
For j = 0 To 4
If j >= i Then
a(i,j) = 1
Else
a(i,j) = 0
End If
Print a(i,j),
Next j
Print
Next i
End Sub
Private Sub Command2_ Click()
'right, triangle
For i = 0 To 4
For j = 0 To 4
If 4 - j