Mr.Wang website
0%

Java HW08 Answer

發表於 分類於
文章字數： 2.2k 所需閱讀時間 ≈ 2 分鐘

8.9

main code

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
package HW08;

import java.security.SecureRandom;
import java.util.Scanner;

public class hw8_9 {
	
	private final static SecureRandom randomNumbers = new SecureRandom();
	
	public static void main(String args[]){
		//user to enter number
		Scanner input = new Scanner(System.in);
		//input the number of random numbers
		//user enter a number
		System.out.print("enter a number : ");
		int n = input.nextInt();
		
		System.out.println("random numbers : ");
		for(int i = 0 ; i < n ; i++){
			System.out.println(10 + randomNumbers.nextInt(91));
		}
	}
	
	
	
}

8.11

class code

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
package HW082;

public class Complex {
	private double realPart;
	private double imaginaryPart;
	//no-argument constructor
	public Complex() {
		this(0,0);
	}
	//constructor of Complex
	public Complex(double realPart,double imaginaryPart) {
		this.realPart = realPart;
		this.imaginaryPart = imaginaryPart;
	}
	//addition
	public void add(Complex left) {
		this.realPart += left.realPart;
		this.imaginaryPart += left.imaginaryPart;
	}
	//subtraction
	public void subtract(Complex left) {
		this.realPart -= left.realPart;
		this.imaginaryPart -= left.imaginaryPart;
	}
	//print out
	public void print_out() {
		System.out.printf("(%f, %f)%n",realPart,imaginaryPart);
	}
	
}

main code

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
package HW082;

public class hw8_11 {
	public static void main(String args[]) {
		//no-argument and argument
		Complex complex1 = new Complex();
		Complex complex2 = new Complex(1,10);
		
		//print out complex1 and complex2
		System.out.println("complex1 & complex2 :");
		complex1.print_out();
		complex2.print_out();
		//addition complex1 and complex2
		complex1.add(complex2);
		//print out complex1 and complex2
		System.out.println("after addition complex1 & complex2 :");
		complex1.print_out();
		complex2.print_out();
		//argument
		Complex complex3 = new Complex(2,8);
		Complex complex4 = new Complex(14,2);
		//print out complex3 and complex4
		System.out.println("complex3 & complex4 :");
		complex3.print_out();
		complex4.print_out();
		//subtract complex3 and complex4
		complex3.subtract(complex4);
		//print out complex3 and complex4
		System.out.println("after subtraction complex3 & complex4 :");
		complex3.print_out();
		complex4.print_out();
	}
}