Write a c program to find out sum of diagonal elements of a matrix.

#include <stdio.h>
 #include <stdlib.h>

 int hcf(int,int,int);
int main()
 {
 int a[4][4],i,j,sum;
 sum=0;
printf("enter a 4x4 matrix");
 for(i=0;i<=3;i++)
 {
 for(j=0;j<=3;j++)
 {
 scanf("%d",&a[i][j]);
 }}
for(i=0;i<=3;i++)
 {
 for(j=0;j<=3;j++)
 {
 if(i==j)
 sum=sum+a[i][j];
 }}
printf("sum of diagonal elements is %d",sum);
 printf("\n");
system("PAUSE");
 }
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