To display the sum of the diagonal of the matrix

In this page I have given the concept to find the sum of the diagonal element of the entered desired matrix. For more information have a look for the source code and the output of the program which is given below in this page.
First of all the output of the program is:

The source code for the above output is:

	#include<stdio.h>
	#include<conio.h>
	int main()
	{
	int a,b,n1[10][10],n,sum=0;
	printf("enter the order of the matrix you want\n");
	scanf("%d",&n);
	printf("enter the element of the matrix\n");
	for(a=0;a<n;a++)
	{
	for(b=0;b<n;b++)
	{
	scanf("%d",&n1[a][b]);
	}
	}
	for(a=0;a<n;a++)
	{
	for(b=0;b<n;b++)
	{
	printf("%d",n1[a][b]);
	}
	printf("\n");
	}
	for(a=0;a<n;a++)
	{
	for(b=0;b<n;b++)
	{
	if(a==b||(a+b)==(n-1))
	sum=sum+n1[a][b];
	}
	}
	printf("\n the sum of the diagonal elements is %d",sum);
	getch();
	}

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