exercise5_19.java

Introduction to java programming 一书中所有编程练习部分的源码

// Exercise5_19.java: Write a method to sum all integers in the
// major diagonal in a matrix of integers.
public class Exercise5_19 {
  // Main method
  public static void main(String[] args) {
    int[][] m = {
      {1, 2, 4, 5},
      {6, 7, 8, 9},
      {10, 11, 12, 13},
      {14, 15, 16, 17}};

    int sum = 0;

    for (int i = 0; i < m.length; i++)
      sum += m[i][i];

    System.out.print("Sum of diagonal is " + sum);
  }
}