Question

using System; using System.Collections.Generic; u

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

namespace ConsoleApplication12
{
class Program
{
static void Main(string[] args)
{
}
}
interface Shape
{
double GetArea();
double GetPerimeter();
}
interface Icomparable()
{
int disp(int r1,int r2);
}
class Circle : Shape, Icomparable
{
public int radius;
public Circle()
{
radius = 0;
}
public Circle(int radius)
{
this.radius = radius;
}
public double GetArea()
{
return Math.PI * Math.Pow(radius, 2);
}
public double GetPerimeter()
{
return Math.PI * radius * 2;
}
public disp(int r1,int r2)
{
if(r1>r2)
return 1;
else if(r1<r2)
return -1;
else
return 0;
}
}
}
然后它说最后那里由于“ConsoleApplication12.Circle.disp(int, int)”返回 void，返回关键字后面不得有对象表达式

Answer 1

函数定义有问题，加个返回类型，改为
public int disp（int r1,int r2）
{}