如何在C＃的乘法表中正确编码循环和循环循环？

Question

我讨厌如此无助，我绝不要求任何人为我做家庭作业，但是出于某些奇怪的原因，我在完成这项任务时遇到了困难，而Loop总是给我带来很多麻烦。 但是我仍然对C＃和OOP有点陌生。

我只是应该通过将嵌套的while循环修改为嵌套的for循环来修改某些代码（教练和我已经写了一些代码）。 并将嵌套的while循环修改为do-while循环 。 循环显然是编程中非常重要的部分，但我想我似乎学得不同，并且想知道缺少了什么...

码：

namespace CS10b
{
    public partial class frmCS10b : Form
    {
        public frmCS10b()
        {
            InitializeComponent();
        }


        private void btnWhileLoop_Click(object sender, EventArgs e)
        {
            int r = 0; //row
            int c = 0; //column
            int intResult;
            string strSpace;

            txtTable.Clear();    //clear the text box
            txtTable.Refresh();  //refresh the form before exiting the method
            Thread.Sleep(1000);  //wait one second to see the clear text box

            //Outer loop goes down the rows
            r = 1;   //initialize r
            while (r < 10)
            {
                //Inner loop goes across the columns
                c = 1;    //initialize c
                while (c < 10)
                {
                    intResult = r * c;

                    if (intResult < 10)
                        strSpace = "  ";  //two spaces 
                    else
                        strSpace = " ";   //one space
                    txtTable.AppendText(strSpace); // insert space

                    txtTable.AppendText(intResult.ToString());  //insert result
                    c++;  //increment c
                }

                txtTable.AppendText("\r\n");  //Move down one line
                r++;  //increment r
            }
        }


        //Modify the nested while loops used above to nested do-while loops
        private void btnDoWhileLoop_Click(object sender, EventArgs e)
        {
            int r = 0; //row
            int c = 0; //column
            int intResult;
            string strSpace;

            txtTable.Clear();    //clear the text box
            txtTable.Refresh();  //refresh the form before exiting the method
            Thread.Sleep(1000);  //wait one second to see the clear text box

            txtTable.AppendText("Nested do-while loops to be developed");  //Delete this after implementation

            //Outer loop goes down the rows
            //initialize r
            //do
            {
                //Inner loop goes across the columns
                //initialize c
                //do
                {
                    intResult = r * c;

                    if (intResult < 10)
                        strSpace = "  ";  //two spaces 
                    else
                        strSpace = " ";   //one space
                    txtTable.AppendText(strSpace); // insert space

                    txtTable.AppendText(intResult.ToString());  //insert result
                    //increment c
                } //while (c < 10);

                txtTable.AppendText("\r\n");  //Move down one line
                //increment r
            } //while (r < 10);
        }


        //Modify the nested while loops used above to nested for loops
        private void btnForLoop_Click(object sender, EventArgs e)
        {
            int r = 0; //row
            int c = 0; //column
            int intResult;
            string strSpace;

            txtTable.Clear();    //clear the text box
            txtTable.Refresh();  //refresh the form before exiting the method
            Thread.Sleep(1000);  //wait one second to see the clear text box

            txtTable.AppendText("Nested do-while loops to be developed");  //Delete this after implementation


            //Outer loop goes down the rows



            //for (initialize r; Boolean Condition, increment r)
             {

                //Inner loop goes across the columns
                //for (initialize c; Boolean Condition, increment c)
                {
                    intResult = r * c;

                    if (intResult < 10)
                        strSpace = "  ";  //two spaces 
                    else
                        strSpace = " ";   //one space
                    txtTable.AppendText(strSpace); // insert space

                    txtTable.AppendText(intResult.ToString());  //insert result
                }

                txtTable.AppendText("\r\n");  //Move down one line
            }
        }


        private void btnExit_Click(object sender, EventArgs e)
        {
            this.Close();
        }


    }//end of form
}//end of namespace

这应该很容易，但是我从未做过的do-while和for-loop循环。 谢谢。

Answer 1

您必须用for循环替换while循环吗？

前循环：

for(int r = 1; r < 10; r++)
   {
      for(int c = 1; c < 10; c++)
         {
            intResult = r * c;
            if (intResult < 10)
            strSpace = "  ";  //two spaces 
            else
            strSpace = " ";   //one space
            txtTable.AppendText(strSpace); // insert space
            txtTable.AppendText(intResult.ToString());  //insert result
         }
      txtTable.AppendText("\r\n");  //Move down one line
   }

Do-While-Loop ：（对此不确定）

int r = 1;
do
    {
        int c = 1;
        do
             {
                  //Your code
             } while c < 10
    } while (r < 10);