Question

我的代码已接近完成，运行正常，但我希望我的if语句不断询问用户得分。就像现在一样，它会要求用户输入一个分数，如果你输入了一个无效的条目，它会给出一行说再试一次，但代码就会停止。我希望它一直提示用户，直到他们输入无效的号码。

//Variables
            double grade;
            string studentName;
            //Prompt the user for the student's name
            Console.WriteLine("Please enter the student's name:");
            studentName = Console.ReadLine();
            //Prompt the user for the student's score
            Console.WriteLine("Please enter the student's score between 0 and 100:");
            if (!(double.TryParse(Console.ReadLine(), out grade)))
            {
               Console.WriteLine("Invalid entry, scores entered must be numeric. Please try again");
            }
            else if (grade >=90)
            {
                Console.WriteLine("{0} has a score of {1} which is an A.", studentName, grade);
            }
            else if (grade < 90 && grade >= 80)
            {
                Console.WriteLine("{0} has a score of {1} which is a B.", studentName, grade);
            }
            else if (grade < 80 && grade >=70)
            {
                Console.WriteLine("{0} has a score of {1} which is a C.", studentName, grade);
            }
            else if (grade < 70 && grade >= 60)
            {
                Console.WriteLine("{0} has a score of {1} which is a D.", studentName, grade);
            }
            else
            {
                Console.WriteLine("{0} has a score of {1} which is an F.", studentName, grade);
            }
            Console.ReadLine();

Answer 1

您可以使用无限while循环 -

while (true)
{
    Console.WriteLine("Please enter the student's name:");
    studentName = Console.ReadLine();
    //Prompt the user for the student's score
    Console.WriteLine("Please enter the student's score between 0 and 100:");
    if (!(double.TryParse(Console.ReadLine(), out grade)))
    {
        Console.WriteLine("Invalid entry, scores entered must be numeric. Please try again");
        break;
    }
    else if (grade >= 90)
    {
        Console.WriteLine("{0} has a score of {1} which is an A.", studentName, grade);
    }
    else if (grade < 90 && grade >= 80)
    {
        Console.WriteLine("{0} has a score of {1} which is a B.", studentName, grade);
    }
    else if (grade < 80 && grade >= 70)
    {
        Console.WriteLine("{0} has a score of {1} which is a C.", studentName, grade);
    }
    else if (grade < 70 && grade >= 60)
    {
        Console.WriteLine("{0} has a score of {1} which is a D.", studentName, grade);
    }
    else
    {
        Console.WriteLine("{0} has a score of {1} which is an F.", studentName, grade);
    }
}

如果输入的值不是数字（根据您的break条件），我添加了while-loop语句来中断if。

无法让我的循环继续提示用户获得分数

1 个答案: