C# C-如何从同一类中的另一个方法调用方法中的变量
我想将num1和num2从setproblem方法调用到displayproblem方法。我不知道该怎么做C# C-如何从同一类中的另一个方法调用方法中的变量,c#,C#,我想将num1和num2从setproblem方法调用到displayproblem方法。我不知道该怎么做 请帮忙…你不能。方法中声明的变量只能在该方法中使用。为了能够在整个类中使用它们,您必须在类级别声明它们: public class MathProblem { public virtual void setproblem() { Random random = new Random(); int num1 = random.Next(100)
请帮忙…你不能。方法中声明的变量只能在该方法中使用。为了能够在整个类中使用它们,您必须在类级别声明它们:
public class MathProblem
{
public virtual void setproblem()
{
Random random = new Random();
int num1 = random.Next(100);
int num2 = random.Next(100);
int sum = num1 + num2;
}
public virtual void askuserforanswer()
{
int answer;
Console.WriteLine("Enter your answer");
answer = Convert.ToInt32(Console.ReadLine());
}
public virtual void displayproblem()
{
Console.WriteLine( num1.ToString() + " + " + num2.ToString() + " = ?");
}
}
public class MathProblem
{
int num1;
int num2;
public virtual void setproblem()
{
Random random = new Random();
num1 = random.Next(100);
num2 = random.Next(100);
int sum = num1 + num2;
}
public virtual void askuserforanswer()
{
int answer;
Console.WriteLine("Enter your answer");
answer = Convert.ToInt32(Console.ReadLine());
}
public virtual void displayproblem()
{
Console.WriteLine( num1.ToString() + " + " + num2.ToString() + " = ?");
}
另外,请注意,我已根据Microsoft的“必须使用字段”将方法名称更改为Pascal大小写
public class MathProblem
{
private Random random = new Random();
private int num1, num2, sum;
public virtual void SetProblem()
{
num1 = random.Next(100);
num2 = random.Next(100);
sum = num1 + num2;
}
public virtual void AskUserForAnswer()
{
int answer;
Console.WriteLine("Enter your answer");
answer = Convert.ToInt32(Console.ReadLine());
}
public virtual void DisplayProblem()
{
Console.WriteLine( num1.ToString() + " + " + num2.ToString() + " = ?");
}
}
}您可以在类级别使用以下字段:
public class MathProblem
{
public virtual void setproblem()
{
Random random = new Random();
int num1 = random.Next(100);
int num2 = random.Next(100);
int sum = num1 + num2;
}
public virtual void askuserforanswer()
{
int answer;
Console.WriteLine("Enter your answer");
answer = Convert.ToInt32(Console.ReadLine());
}
public virtual void displayproblem()
{
Console.WriteLine( num1.ToString() + " + " + num2.ToString() + " = ?");
}
}
public class MathProblem
{
int num1;
int num2;
public virtual void setproblem()
{
Random random = new Random();
num1 = random.Next(100);
num2 = random.Next(100);
int sum = num1 + num2;
}
public virtual void askuserforanswer()
{
int answer;
Console.WriteLine("Enter your answer");
answer = Convert.ToInt32(Console.ReadLine());
}
public virtual void displayproblem()
{
Console.WriteLine( num1.ToString() + " + " + num2.ToString() + " = ?");
}
如果在类之外需要这些属性,可以使用以下属性:
public class MathProblem
{
int num1;
int num2;
... rest of code unchanged
}
或者,如果您希望能够从类外设置它们:
public class MathProblem
{
public int num1 { get; private set;}
public int num2 { get; private set;}
... rest of code unchanged
}
还有一些提示:
如果使用属性,则使用CAMELLOCASE,例如Num1,而不是Num1
还可以在camelcasting中更改方法名称,例如SetProblem、AskUserForAnswer、DisplayProblem。
这些是局部变量,因为它们是在方法中声明的。当方法退出时,它们将被销毁,并且不能在方法之外使用它们。要实现您的功能,您需要在类全局范围内声明它们。最好读一些让你的方法名称更清楚我会把它们改成所谓的camelcasting,例如SetProblem,AskUserForAnswer,DisplayProblem。这次计算机总是给num1 0,num2总是要求0+0你确定你在调用SetProblem方法吗?