public static double tuoqiu()
{
Console.WriteLine("请选择椭球类型:");
Console.WriteLine("如果为克拉索夫斯基椭球请输入1");
Console.WriteLine("如果为IAG-75椭球请输入2");
Console.WriteLine("如果为WGS-84椭球请输入3");
Console.WriteLine("如果为CGCS2000椭球请输入4");
string tuoqiu = Console.ReadLine();
int temp = int.Parse(tuoqiu);
double f;
switch (temp)
{
case 1: f = 1 / 298.3; break;
case 2: f = 1 / 298.257; break;
case 3: f = 1 / 298.257223563; break;
case 4: f = 1 / 298.257222101; break;
}
return f;
}

c#中switch语句怎么用,不能再case中赋值吗,为什么我这个最后局部变量f未赋值?
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