**/* All elements are zero */**

**#include**

**<iostream.h>**

**#include**

**<conio.h>**

**void main()**

{

int mat[10][10];

cout<< "\n Enter dimension of square matrix;";

{

int mat[10][10];

cout<< "\n Enter dimension of square matrix;";

**int n;**

**cin>>n;**

cout<< "\n Enter the elements for the matrix :";

for(int i=0; i< n ; i++)

for (int j = 0; j< n ; j++)

{ cout<<"\n Element for positon : " << i+1 << " , " << j+1 << ":";

cin>> mat[i][j];

}

cout<< "\n Enter the elements for the matrix :";

for(int i=0; i< n ; i++)

for (int j = 0; j< n ; j++)

{ cout<<"\n Element for positon : " << i+1 << " , " << j+1 << ":";

cin>> mat[i][j];

}

**int flag = 0;****for(int i=0; i< n ; i++)****for (int j = 0; j< n ; j++)****{ if(mat[i][j] != 0)****{ flag = 1;****break; }****}****if(flag == 0)****cout<< "\n Null Matrix .";****else****cout<<"\n Not a Null Matrix.";****cout<<"\n\n Matrix :";****for(int i=0; i< n ; i++)****{for (int j = 0; j< n ; j++)****cout<< mat[i][j] << " ";****cout<< endl;****}****getch();****}**
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