java - 如何将这个 while 循环转换为 for 循环？

Question

我应该编写将 0 到 10 之间的数字乘以 2 到 10 的代码。它应该使用 for 循环。我能够将其作为 while 循环来想出，但是我尝试转换的任何内容都会给我带来一堆错误。我发布的 while 代码可以工作，它只需要采用 for 循环格式即可。

while(numberCounter <= 10)
{
 byTen = numberCounter * 10;
 byTwo = numberCounter * 2;
 System.out.println(numberCounter + "\t" + byTwo + "\t" + byTen);
 numberCounter++;
 }

这就是整个问题:

// NewMultiply.java - This program prints the numbers 0 through 10 along
// with these values multiplied by 2 and by 10.
// Input:  None.
// Output: Prints the numbers 0 through 10 along with their values multiplied by 2 and by 10. 

 public class NewMultiply
{
 public static void main(String args[])
 {

  String head1 = "Number: ";
  String head2 = "Multiplied by 2: ";
  String head3 = "Multiplied by 10:  ";           
  int numberCounter = 0;   // Numbers 0 through 10.
  int byTen;     // Stores the number multiplied by 10.
  int byTwo;          // Stores the number multiplied by 2.
  final int NUM_LOOPS = 10; // Constant used to control loop.

  // This is the work done in the housekeeping() method
  System.out.println("0 through 10 multiplied by 2 and by 10" + "\n");

  // This is the work done in the detailLoop() method
  // Write for loop

    // This is the work done in the endOfJob() method
            System.exit(0);
} // End of main() method.

} // End of NewMultiply class.

我明白了。非常感谢大家的帮助。问题是我有 (numberCounter <= 10) 而不是使用初始化的 NUM_LOOPS。再次感谢!

Answer 1

for语句由初始化变量、结束条件和单步操作三部分组成。您的代码中包含所有这些内容

//initialize
int numberCount = 0;
...
//end condition
while(numberCounter <= 10)
...
//next step
numberCounter++;

您只需将它们放在 for 语句中，然后将 while 循环的剩余逻辑放在 for 语句后面的大括号中