如何解决错误:“未分配的局部变量”为等级?我尝试在“字符串”之前使用公共和私有前缀,但是没有用。有人可以解释一下私人和公共机构也做什么吗?谢谢。
using System;
public class Program
{
public static void Main()
{
bool answered = false;
string grade;
while(answered == false)
{
Console.Write("What is your mark? ");
int mark = Convert.ToInt16(Console.ReadLine());
answered = true;
if(mark >= 90 && mark <= 100)
{
grade = "A";
} else if(mark >= 80 && mark < 90)
{
grade = "B";
} else if(mark >= 55 && mark < 80)
{
grade = "C";
} else if(mark >= 40 && mark < 55)
{
grade = "D";
} else if(mark >= 0 && mark < 40)
{
grade = "E";
} else
{
Console.WriteLine("Please enter your mark between 0-100");
answered = false;
}
Console.WriteLine("Your grade is a " + grade);
Console.ReadLine();
}
}
}
您需要确保在所有情况下都为grade
分配一个值,以便它始终具有一个值。您可以先用一个值初始化它:
string grade = "";
或者,在所有条件下都将其设置为值,这意味着在此处的其他位置中将其设置为:
else
{
Console.WriteLine("Please enter your mark between 0-100");
grade = "";
}