Question

所以，我是一名软件新生，我正在做我的任务，这可能看起来像一个简单的问题，但它正在破坏我的头脑。

分配是让用户输入6个学校科目和他们为每个科目获得的分数，然后将分数计算为分数并显示。我觉得我已经完成了代码的骨架，但是当我运行程序时，无论我在答案中输入什么输入似乎总是无效。

感谢您的帮助，乔

这是我正在使用的代码，它在Visual Studio中使用。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace caoAssignment
{
    class Program
    {
        static void Main(string[] args)
        {
            // Delcaring variables //
            string subIn, sub1, sub2, sub3, sub4, sub5, sub6;
            string gradeIn, grade1, grade2, grade3, grade4, grade5, grade6;
            int pointsIn, points1, points2, points3, points4, points5, points6;
            int x;
            string doAgain = "";

            // Getting the user to input necessary information. 2 peices needed. 

            do
            {
                x = 1;
                while (x <= 6)
                {
                    Console.WriteLine("Please enter a subject ");
                    subIn = Console.ReadLine();

                    Console.WriteLine("Please enter the grade you got in that                      subject (H1 - O8) ");
                    gradeIn = Console.ReadLine();

                    // Processing the grades in points //

                    if (gradeIn == "H1")
                        pointsIn = 100;

                    if (gradeIn == "H2")
                        pointsIn = 88;

                    if (gradeIn == "H3")
                        pointsIn = 77;

                    if (gradeIn == "H4")
                        pointsIn = 66;

                    if (gradeIn == "H5")
                        pointsIn = 56;

                    if (gradeIn == "H6")
                        pointsIn = 46;

                    if (gradeIn == "H7")
                        pointsIn = 37;

                    if (gradeIn == "H8")
                        pointsIn = 0;

                    if (gradeIn == "O1")
                        pointsIn = 56;

                    if (gradeIn == "O2")
                        pointsIn = 46;

                    if (gradeIn == "O3")
                        pointsIn = 37;

                    if (gradeIn == "O4")
                        pointsIn = 28;

                    if (gradeIn == "O5")
                        pointsIn = 20;

                    if (gradeIn == "O6")
                        pointsIn = 12;

                    if (gradeIn == "O7")
                        pointsIn = 0;

                    if (gradeIn == "O8")
                        pointsIn = 0;

                    else
                        Console.WriteLine("Input is wrong, please redo. ");


                    // Assigning each grade,subject and points depending on what X is //
                    if (x == 1)
                    {
                        subIn = sub1;
                        gradeIn = grade1;
                        pointsIn = points1;

                    }

                    if (x == 2)
                    {
                        subIn = sub2;
                        gradeIn = grade2;
                        pointsIn = points2;

                    }

                    if (x == 3)
                    {
                        subIn = sub3;
                        gradeIn = grade3;
                        pointsIn = points3;

                    }

                    if (x == 4)
                    {
                        subIn = sub4;
                        gradeIn = grade4;
                        pointsIn = points4;

                    }

                    if (x == 5)
                    {
                        subIn = sub5;
                        gradeIn = grade5;
                        pointsIn = points5;

                    }

                    if (x == 6)
                    {
                        subIn = sub6;
                        gradeIn = grade6;
                        pointsIn = points6;

                    }

                    x++;
                } // End of the while loop

                Console.WriteLine("Do again? (Y/N) ");
                doAgain = Console.ReadLine();

            } // End of the do loop
            while (doAgain == "Y"); 

            // Command to keep the program open for the user //
            Console.ReadKey();

        }
    }
}

Answer 1

看一下代码的这一部分：

if (gradeIn == "O7")
    pointsIn = 0;

if (gradeIn == "O8")
    pointsIn = 0;
else
    Console.WriteLine("Input is wrong, please redo. ");

如果成绩不是“08”会怎样？ else语句仅适用于最后一个if语句。另外一个好的经验法则是始终在if，else等之后添加花括号来表示范围并避免错误。

如果您使用if链接else语句，则告诉程序下一个if仅在未应用上一个if (gradeIn == "O7") { pointsIn = 0; } else if (gradeIn == "O8") { pointsIn = 0; } else { Console.WriteLine("Input is wrong, please redo. "); }时才会应用。

==

使用string.Equals运算符比较字符串时，比较区分大小写。要使其不区分大小写，请使用重载的if(string.Equals(gradeIn, "O7", StringComparison.OrdinalIgnoreCase))方法：

 public void setCurrentFragment(Fragment currentFragment) {
                this.currentFragment = currentFragment;
               }

Answer 2

首先，项目不应该编译，因为代码试图使用未分配的变量。 SUB1

//Assigning each grade,subject and points depending on what X is 
if (x == 1)
{
subIn = sub1;
gradeIn = grade1;
pointsIn = points1;
}

其次

subIn = sub2;

这应该是另一种方式。第一个值是您要分配第二个值的变量。

用户输入时无法识别输入

2 个答案: