Java 程序查找矩阵的迹

编写一个Java程序，使用for循环查找矩阵的迹。矩阵的迹是其对角线元素之和。在这个Java示例中，我们使用嵌套的for循环来迭代矩阵的行和列。接下来，if(i == j)检查它是否是对角线元素，并将该元素加到迹中。

package NumPrograms;

import java.util.Scanner;

public class MatrixTrace1 {
	
	private static Scanner sc;	
	
	public static void main(String[] args) {
		
		int i, j, rows, columns, trace = 0;	
		sc= new Scanner(System.in);	
		
		System.out.print("Enter Matrix Rows and Columns =  ");
		rows = sc.nextInt();
		columns = sc.nextInt();
		
		int[][] Tra_arr = new int[rows][columns];
		
		System.out.println("Please Enter the Matrix Items =  ");
		for(i = 0; i < rows; i++) 
		{
			for(j = 0; j < columns; j++) 
			{
				Tra_arr[i][j] = sc.nextInt();
			}		
		}
		
		for(i = 0; i < rows; i++) 
		{
			for(j = 0; j < columns; j++) 
			{
				if(i == j)
				{
					trace = trace + Tra_arr[i][j];
				}
			}		
		}
		
		System.out.println("\nThe Trace Of the Matrix = " + trace);

	}
}

使用while循环查找矩阵迹的Java程序

package NumPrograms;

import java.util.Scanner;

public class MatrixTrace2 {
	private static Scanner sc;	
	public static void main(String[] args) {
		
		int i, j, rows, columns, trace = 0;	
		sc= new Scanner(System.in);	
		
		System.out.print("Enter Matrix Rows and Columns =  ");
		rows = sc.nextInt();
		columns = sc.nextInt();
		
		int[][] Tra_arr = new int[rows][columns];
		
		System.out.println("Please Enter the Matrix Items =  ");
		i = 0; 
		while(i < rows) 
		{
			j = 0; 
			while(j < columns) 
			{
				Tra_arr[i][j] = sc.nextInt();
				j++;
			}	
			i++;
		}
		
		i = 0; 
		while(i < rows) 
		{
			j = 0; 
			while(j < columns) 
			{
				if(i == j)
				{
					trace = trace + Tra_arr[i][j];
				}
				j++;
			}	
			i++;
		}
		
		System.out.println("\nThe Trace Of the Matrix = " + trace);

	}
}

Enter Matrix Rows and Columns =  3 3
Please Enter the Matrix Items =  
10 20 30
40 50 60
70 80 125

The Trace Of the Matrix = 185

这个Java示例使用do while循环来计算和打印给定矩阵的迹。

package NumPrograms;

import java.util.Scanner;

public class MatrixTrace3 {
	private static Scanner sc;	
	public static void main(String[] args) {
		
		int i, j, rows, columns, trace = 0;	
		sc= new Scanner(System.in);	
		
		System.out.print("Enter Matrix Rows and Columns =  ");
		rows = sc.nextInt();
		columns = sc.nextInt();
		
		int[][] Tra_arr = new int[rows][columns];
		
		System.out.println("Please Enter the Matrix Items =  ");
		i = 0; 
		do 
		{
			j = 0; 
			do 
			{
				Tra_arr[i][j] = sc.nextInt();
				if(i == j) 
				{
					trace = trace + Tra_arr[i][j];
				}
			}while(++j < columns);	
		}while(++i < rows);
		
		System.out.println("\nThe Trace Of the Matrix = " + trace);

	}
}

Enter Matrix Rows and Columns =  3 3
Please Enter the Matrix Items =  
19 22 45
77 88 125
13 50 500

The Trace Of the Matrix = 607