#include<conio.h>
#include<stdio.h>
#include<stdlib.h>
#include<dos.h>
void main()
{
 int a[5][5],m,n,i,j,s=0;
 clrscr();
 printf("ENTER ORDER OF MATRIX:");
 scanf("%d %d",&m,&n);
 if(m!=n)
 {
  printf("NOT A SQUARE MATRIX:");
  delay(1000);
  exit(0);
 }
 printf("ENTER THE ELEMENTS OF THE MATRIX:");
 for(i=0;i<m;i++)
  for(j=0;j<n;j++)
  {
   scanf("%d",&a[i][j]);
   if(i==j) s+=a[i][j];
  }
 printf("TRACE OF THE MATRIX IS  %d",s);
 getch();
}