Question

Given: int[][] matrix = new int[5][5] Using the statement above, write a nested loop to set matrix as follows: [0] [1] [2] [3] [4] [0] 1 0 0 0 0 [1] 0 2 0 0 0 [2] 0 0 3 0 0 [3] 0 0 0 4 0 [4] 0 0 0 0 5

Answer 1

//TestCode.java
public class TestCode {
    public static void main(String[] args) {
        int[][] matrix = new int[5][5];

        //Setting up the values
        for(int i = 0;i<matrix.length;i++){
            for(int j = 0;j<matrix[i].length;j++){
                if(i == j){
                    matrix[i][j] = i+1;
                }
                else{
                    matrix[i][j] = 0;
                }
            }
        }

        //Printing the matrix
        for(int i = 0;i<matrix.length;i++){
            for(int j = 0;j<matrix[i].length;j++){
                System.out.print(matrix[i][j]+" ");
            }
            System.out.println();
        }

    }
}

for(int i = 0;i<matrix.length;i++){
    for(int j = 0;j<matrix[i].length;j++){
        if(i == j){
            matrix[i][j] = i+1;
        }
        else{
            matrix[i][j] = 0;
        }
    }
}