package DZ5DZ6.HomeWork1StarArrays;

/**
 * Created by Максим Беседа on 28.04.2016.
 */
public class IdentityMatrixChecker {
    static boolean isIdentity(int[][] matrix){
        boolean identity = true;
        if (matrix.length != matrix[0].length){
            throw new IllegalArgumentException();
        }
        else {
            for (int i = 0; i < matrix.length; i++){
                for (int j = 0; j < matrix[0].length; j++){
                    if ((i == j) && (matrix[i][j] != 1)){
                        identity = false;
                    }
                    if ((i != j) && (matrix[i][j] != 0)){
                        identity = false;
                    }
                }
            }
        }
        return identity;
    }

    public static void main(String[] args) {
        System.out.println(isIdentity(new int[][]{{1, 0, 0},
                                                  {0, 1, 0},
                                                  {0, 0, 1}}));
    }
}