JAVA
java
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public class Program
{
public static void main(String[] args) {
int[][] matrix = {{1,2,3},{4,5,6},{7,8,9}};
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();
}
System.out.println();
//first diagonal: 1 5 8
//matrix[0][0], matrix[1][1],
//matrix[2][2]
int j = 0;
for(int i = 0; i < matrix.length; i++){
System.out.print(matrix[i][j] + " ");
j++;
}
System.out.println();
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OUTPUT
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