#include<stdio.h>
int main()
{
int arr1[3][3],i,j,rows,col,sum=0;
int *p=&arr1[i][j];
printf("\n Please Enter Number of rows and columns : ");
scanf("%d %d", &rows, &col);
printf("Input elements in the matrix :\n");
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
printf("element - [%d],[%d] : ",i,j);
scanf("%d",&arr1[i][j]);
}
}
printf("\nThe matrix is : \n");
for(i=0;i<3;i++)
{
printf("\n");
for(j=0;j<3;j++)
printf("%d\t",arr1[i][j]);
}
printf("\n\n");
for(i=0;i<rows;i++)
{
for(j=0;j<col;j++)
{
if(i==j)
{
sum=sum+arr1[i][j];
}
}
}
printf("The sum of diagonal elements of a square matrix = %d\n",sum);
}