1.

Write a program in Java to input an NxN matrix and display it row-wise and column-wise.

Answer»

Simply input the matrix. Now, display the matrix row-wise by starting from the first row and moving to the next elements within the same row. For displaying column-wise, start from the first column and keep moving in the same column to the next elements. This is shown below.

Java Code to input and display 2-D Matrix

import java.util.*;
class Main {
public static void main(String args[]) {
// Your code goes here
Scanner scn = new Scanner(System.in);
int N = scn.nextInt();
int[][] mat = new int[N][N];

for(int i=0;i<N;i++) {
for(int j=0;j<N;j++) {
mat[i][j] = scn.nextInt();
}
}

//Display Row wise
for(int i=0;i<N;i++) {
System.out.print("Row " + i + " : ");
for(int j=0;j<N;j++) {
System.out.print(mat[i][j] + " ");
}
System.out.println("\t");
}

System.out.println();

//Display Col wise
for(int j=0;j<N;j++) {
System.out.print("Col " + j + " : ");
for(int i=0;i<N;i++) {
System.out.print(mat[i][j] + " ");
}
System.out.println("\t");
}
}
}

Sample Output

Input:

3
1 2 3
4 5 6
7 8 9

Output:

Row 0 : 1 2 3    
Row 1 : 4 5 6    
Row 2 : 7 8 9
    
Col 0 : 1 4 7    
Col 1 : 2 5 8    
Col 2 : 3 6 9


  • Time Complexity: O(N to the power 2) as we traverse the 2-D array to print it.


  • Auxiliary Space: O(1) as we have not used any extra space.


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