Java程式查詢斐波那契數列中偶數之和直到數字N
在本文中,我們將瞭解如何找到斐波那契數列中偶數之和直到數字N。斐波那契數列是由其前兩個整數之和形成的一系列數字。偶數斐波那契數列是斐波那契數列中的所有偶數。
斐波那契數列透過將前兩個數字相加生成後續數字。斐波那契數列從兩個數字開始 - F0 和 F1。F0 和 F1 的初始值可以分別取 0、1 或 1、1。
Fn = Fn-1 + Fn-2
因此,斐波那契數列可能如下所示:
F8 = 0 1 1 2 3 5 8 13
或者,這樣:
F8 = 1 1 2 3 5 8 13 21
以下是斐波那契數列偶數之和的演示:
輸入
假設我們的輸入是:
Value of n is: 10
輸出
期望的輸出將是:
Even sum of Fibonacci series is 10945
演算法
Step1- Start Step 2- Declare three integers my_input, i, sum Step 3- Prompt the user to enter two integer value/ Hardcode the integer Step 4- Read the values Step 5- Use a for loop to iterate through the integers from 1 to N and assign the sum of consequent two numbers as the current Fibonacci number. Step 6- Display the result Step 7- Stop
示例 1
在這裡,輸入是根據提示由使用者輸入的。您可以在我們的程式碼練習工具 中即時嘗試此示例。
import java.util.Scanner; import java.io.*; public class FabonacciSum { public static void main(String[] args){ int my_input, i, sum; System.out.println("Required packages have been imported"); Scanner my_scanner = new Scanner(System.in); System.out.println("A reader object has been defined "); System.out.println("Enter the value of N: "); my_input = my_scanner.nextInt(); int fabonacci[] = new int[2 * my_input + 1]; fabonacci[0] = 0; fabonacci[1] = 1; sum = 0; for (i = 2; i <= 2 * my_input; i++) { fabonacci[i] = fabonacci[i - 1] + fabonacci[i - 2]; if (i % 2 == 0) sum += fabonacci[i]; } System.out.printf("Even sum of fibonacci series till number %d is %d" , my_input, sum); } }
輸出
Required packages have been imported A reader object has been defined Enter the value of N: 10 Even sum of fibonacci series till number 10 is 10945
示例 2
在這裡,整數已預先定義,並在控制檯上訪問和顯示其值。
import java.util.Scanner; import java.io.*; public class FabonacciSum { public static void main(String[] args){ int my_input, j, sum; my_input = 10; System.out.println("The value of N: "); int fabonacci[] = new int[2 * my_input + 1]; fabonacci[0] = 0; fabonacci[1] = 1; sum = 0; for (j = 2; j <= 2 * my_input; j++) { fabonacci[j] = fabonacci[j - 1] + fabonacci[j - 2]; if (j % 2 == 0) sum += fabonacci[j]; } System.out.printf("The even sum of fibonacci series till number %d is %d" , my_input, sum); } }
輸出
The value of N: The even sum of fibonacci series till number 10 is 10945
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