//C program to demonstrate the boundary 
//element of matrix
#include <stdio.h>

//This function display the Boundary of a matrix
void printBoundary(int mat[][4],int m,int n)
{
    printf("\n Boundary of Matrix\n");
    for(int i=0;i<m;i++){
        for(int j=0;j<n;j++){
            if(i==0 || j==0 || i==n-1
                || j==n-1)
                printf("%d",mat[i][j]);
            else
                printf(" ");
        }
        printf("\n");
    }
}

//Driver code
int main() 
{
    int mat[4][4]={{1,2,3,4},
                   {1,2,3,4}, 
                   {1,2,3,4},
                   {1,2,3,4} };

    printf("\n Input Matrix \n");
    for(int i=0;i<4;i++){
        for(int j=0;j<4;j++){
            printf(" %d",mat[i][j]);
        }
        printf(" \n");
    }

    //printBoundary(a,4,4) function accepts a matrix,no
    //of rows and columns as input and display boundaries of
    //matrix
    printBoundary(mat,4,4);
    return 0;
}