import java.util.Scanner;

//求一個3*3矩陣對角線元素之和*
public class GetSum {
public static void main(String[] args) {
int[][] array=new int[3][3];
int cout=0,sum=0;
// 輸入3*3矩陣
System.out.println(“請輸入3*3矩陣的九個數： “);
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
Scanner nScanner=new Scanner(System.in);
array[i][j]=nScanner.nextInt();
}
}

// 顯示3*3矩陣
System.out.println(“已輸入的3*3矩陣:\n”);
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
System.out.print(array[i][j]+”\t”);
cout++;
if(cout%3==0){
System.out.println();
}
}
}
// 計算對角線之和並列印
for (int i = 0; i < 3; i++)
for (int j = 0; j < 3; j++) {
if (i == j||(i+j)==2)
sum = sum + array[i][j];
}
System.out.println(“\n對角線之和sum=”+sum);
}
}