Question

我正在编写Fibonacci系列，每一件事都运行正常，但我没有限制输出符合while条件（输出＆lt; maxOutput）无法将输出限制为用户输入的值。我在哪里得到我的条件错误。请参阅下面的代码

import java.util.Scanner;

public class Fibonacci {

    private static int fib(int prev_Total, int current_Num) {
        return  current_Num + prev_Total; // return sum of the two
    }

    public static void main(String[] args){
        int f_Num, s_Num, maxOutput;

        Scanner maxNum = new Scanner(System.in);

        System.out.println("Enter the first value: ");
        f_Num = maxNum.nextInt(); 
        System.out.println("Enter the second value: ");
        s_Num = maxNum.nextInt(); 
        System.out.println("Enter the maximum value of the series: ");
        maxOutput = maxNum.nextInt(); 

        System.out.println(f_Num);  // print the first value by default 
        System.out.println(s_Num); // print the second value by default

        int prevTotal = f_Num; // initialise prevTotal
        int currentNum = s_Num; // initialise currentTotal
        int output = 0;  // initialise output

        while (output < maxOutput) {

            output = fib(currentNum, prevTotal); // assign the result of first two numbers added together to first output
            prevTotal = currentNum;  // update prevTotal (currentNum becomes our new prevTotal)
            currentNum = output;     // update currentNum (output becomes our new currentNum)
            System.out.println(output); // print output 

        }
    }
}

Answer 1

这应该有效：

while (true) {
    // assign the result of first two numbers added together to first output
    output = fib(currentNum, prevTotal);

    // update prevTotal (currentNum becomes our new prevTotal)
    prevTotal = currentNum;

    currentNum = output;
    if (output > maxOutput) {
        break;
    }
    // print output 
    System.out.println(output);
}

...希望我帮助过你！

Answer 2

反转循环，使用do .. while（）它将起作用。

编辑：

放入System.out.println（输出）;在循环的第一行，在while之后，如：

  while (output < maxOutput){
        System.out.println(output); // print output 
      ...

Answer 3

你的for循环应该有点像：

while (output < maxOutput){
    System.out.println(output); // print output 
    output = fib(currentNum, prevTotal); // assign the result of first two numbers added together to first output
    prevTotal = currentNum;  // update prevTotal (currentNum becomes our new prevTotal)
    currentNum = output;     // update currentNum (output becomes our new currentNum)
}

编辑：逻辑上的轻微编辑可以解决

int output = 0;
int prevTotal = s_Num; // initialise prevTotal
int currentNum = output = fib(f_Num, prevTotal); // initialise currentTotal with output
while (output < maxOutput){
    System.out.println(output); // print output 
    output = fib(currentNum, prevTotal); // assign the result of first two numbers added together to first output
    prevTotal = currentNum;  // update prevTotal (currentNum becomes our new prevTotal)
    currentNum = output;     // update currentNum (output becomes our new currentNum)
}

虽然循环条件没有给出预期的结果

3 个答案: