如何使用'for循环'代替'while循环'

Question

不得不使用while,do-while和for循环为在线java类编写以下程序.寻找一点解释.提前致谢!
PS虽然寻找参考书籍是Java还是Javascript？有关好的参考书的任何建议吗？我得到了这个概念,大多数情况下,魔鬼肯定在细节中.

public class ExamsFor {

    public static void main(String[] arguments) {


    int inputNumber; // One of the exams input by the user.
    int sum;     // The sum of the exams.
    int count;   // Number of exams.
    Double Avg;    // The average of the exams.


    /* Initialize the summation and counting variables. */

    sum = 0;
    count = 0;

    /* Read and process the user's input. */

    TextIO.put("Please enter the first exam: "); // get the first exam.


        inputNumber = TextIO.getlnInt();

    for (inputNumber!=0; sum += inputNubmer; count++ ) {  // had the while loop below enter here, worked

    TextIO.put("Please enter the next exam, or 0 to end: "); // get the next exam.  
    inputNumber = TextIO.getlnInt();
    } 

    /* Display the result. */

    if (count == 0) {
    TextIO.putln("You didn't enter any data!");
    }
    else {
    Avg = ((double)sum) / count;
    TextIO.putln();
    TextIO.putln("You entered " + count + " exams.");
    TextIO.putf("The average for the exams entered is %1.2f.\n", Avg);
    } 

    } // end main ()
}  // end class ExamsFor

/*  Had the following 'while loop' in place of the 'for loop'


while (inputNumber != 0) {
    sum += inputNumber;  // Add inputNumber to running sum.
    count ++;        // Count the input by adding 1 to the count.

*/

Answer 1

你可以比较两者for和while语句观察,你在迭代结构中主要需要4个东西:

• 条件中使用的值的初始值(A)
• 用于检查是否保持迭代的条件(B)
• 一个声明,修改每次检查的值(C)
• 陈述本身的主体(BODY)

因为for你有

for (A; B; C)
  BODY

而对于while(在这里充满了单词笑话:)你有类似的东西

A;
while (B)
{
  BODY;
  C;
}

这很简单,不是吗？