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我已经在这几个小时了！！！！对分配的更新指出，当用户输入的值超过 100 时，我们需要停止用户输入。在不重写整个内容的情况下，我如何“循环”它呢？我知道代码方法繁重，但这是分配的要求。我认为我的大脑只是 java 汤！任何帮助都是极好的 ：）

public static void main(String[] args) {
    //Use Main Method for gathering input
    float input = 1;
    // Declare variable for sum
    float theSum = 0;
    // Declare variable for average
    float average = 0;
    // Declare variable for counting the number of user inputs
    int counter = 0;
    /* Initialize the while loop using an input of 0 as a sentinel value
     * to exit the loop*/
    while (input != 0) {
        // Use JOptionPane method to accept input from user
        input = Float.parseFloat(
                JOptionPane.showInputDialog(
                null, "Please enter a number.  Enter 0 to quit: "));
        // Invoke sum method and pass input and summation to sum method
        theSum = (sum(input, theSum));
        // Invoke avg method and pass summation and counter to avg
        average = (avg(theSum, counter));
        // Increment the counter variable
        counter++;
    }
    // Invoke display method and pass summation, average, and counter variables to it
    display(theSum, average, counter);
}
public static float sum(float num1, float sum) {
    //Add the user's input number to the sum variable
    sum += num1;

    //Return value of sum variable as new summation variable
    return sum;
}
public static float avg(float num1, int num2) {
    //Declare and initialize variable for average
    float average = 0;

    //Calculate average
    average = num1 / num2;

    //Return value of average variable
    return average;
}
public static void display(float sum, float average, int counter) {

    /* I am subtracting 1 from variable counter so as not to include the sentinel value
     * of 0 that the user had to enter to exit the input loop in the overall count*/

    // Display the count, sum, and average to the user
    JOptionPane.showMessageDialog(null, "Count = " + (counter - 1) + ", Sum = " + sum + ", Average = " + average);

    // Test to see if sum is greater than 100 and if so, display alert to user
    if (sum > 100) {
        JOptionPane.showMessageDialog(null, "The sum of your numbers is greater than 100!");
    }
}

}

如果我在 counter++ 之后输入此信息 用户在第一次输入后收到此消息...我做错了什么！！！！！！

if (theSum > 100)
            break;
                JOptionPane.showMessageDialog(null, "The sum of your numbers is greater than 100!");

中断的问题是"JOptionPane.showMessageDialog(null, "The sum of your numbers is greater than 100!");" 在中断后立即放置一段代码会导致一些输出问题。现在的问题是 sum>100 的平均值输出的是总和，而不是平均值。它适用于 sum<=100...WTH?!?! :)

现在是代码：

public static void main(String[] args) {
    //Use Main Method for gathering input
    float input = 1;
    // Declare variable for sum
    float theSum = 0;
    // Declare variable for average
    float average = 0;
    // Declare variable for counting the number of user inputs
    int counter = 0;
    /* Initialize the while loop using an input of 0 as a sentinel value
     * to exit the loop*/
    while (input != 0) {
        // Use JOptionPane method to accept input from user
        input = Float.parseFloat(
                JOptionPane.showInputDialog(
                null, "Please enter a number.  Enter 0 to quit: "));
        // Invoke sum method and pass input and summation to sum method
        theSum = (sum(input, theSum));
        // Invoke avg method and pass summation and counter to avg
        average = (avg(theSum, counter));
        // Increment the counter variable
        counter++;

        if (theSum > 100)
            break;                                
    }
    // Invoke display method and pass summation, average, and counter variables to it
    display(theSum, average, counter);
}
public static float sum(float num1, float sum) {
    //Add the user's input number to the sum variable
    sum += num1;        
    //Return value of sum variable as new summation variable
    return sum;
}
public static float avg(float num1, int num2) {
    //Declare and initialize variable for average
    float average = 0;
    //Calculate average
    average = num1 / num2;
    //Return value of average variable
    return average;
}
public static void display(float sum, float average, int counter) {

    /* I am subtracting 1 from variable counter so as not to include the sentinel value
     * of 0 that the user had to enter to exit the input loop in the overall count*/

    // Display the count, sum, and average to the user
    if (sum >100)
    JOptionPane.showMessageDialog(null, "Count = " + (counter) + ", Sum = " + sum + ", Average = " + average);
    if (sum <= 100)
    JOptionPane.showMessageDialog(null, "Count = " + (counter-1) + ", Sum = " + sum + ", Average = " + average);

    }
}
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2 回答 2

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在循环中使用带有条件的break语句来检查 . 希望这些提示将帮助您获得所需的行为。由于您还需要计算平均值，因此将中断逻辑置于 avg 后：whileifthesum > 100

     while (input != 0) {
    // Use JOptionPane method to accept input from user
    input = Float.parseFloat(
            JOptionPane.showInputDialog(
            null, "Please enter a number.  Enter 0 to quit: "));
    // Invoke sum method and pass input and summation to sum method
    theSum = (sum(input, theSum));
    // Invoke avg method and pass summation and counter to avg
    average = (avg(theSum, counter));
    // Increment the counter variable
    counter++;
    if (theSum > 100)
      break;
}
// Invoke display method and pass summation, average, and counter variables to it
display(theSum, average, counter);
于 2013-09-14T00:42:56.430 回答
0

将循环更改为

do { ... } while (input != 0 && sum < 100);

在循环停止之前，您不需要计算平均值。

于 2013-09-14T00:55:05.860 回答