作者INsoarDEEP (green)
看板EE_DSnP
標題[問題] 關於第2題
時間Mon Oct 22 19:51:04 2007
Compiler跟我說Int main()裡面的Circle::getPerimeter()沒有matching function
但我不會修正，想請大家指點一下，感謝！
這是我的程式碼
#include <iostream>
using namespace std;
class Circle
{public:
float getPerimeter(float a,int b,int c)
{cin >> a >> b >> c ;
cout << 2*a*3.14;
}
float getArea(float a,int b,int c)
{cin >> a >> b >> c ;
cout << 3.14*a*a ;
}
};
class Square
{public:
float getArea()
{cin >> d >> e >> f ;
cout << d*d;
}
float getPerimeter()
{cin >> d >> e >> f ;
cout << 4*d;
}
private:
float d;
int e,f;
};
int main()
{
float r1, r2;
int x1, y1, x2, y2;
cout << "Please enter the radius and center coordinates "
<< "for the circle (r/x/y): ";
cin >> r1 >> x1 >> y1;
cout << "Please enter the side length and center coordinates "
<< "for the Square (s/x/y): ";
cin >> r2 >> x2 >> y2;
Circle c1;
Square s2;
float p1 = c1.getPerimeter(), p2 = s2.getPerimeter();
if (p1 > p2)
cout << "Circle has larger perimeter (" << p1 << ") than "
<< "Square(“ << p2 << “)!!" << endl;
else
cout << "Circle has smaller perimeter (“ << p1 << “) than "
<< "Square(“ << p2 << “)!!" << endl;
float a1 = c1.getArea(), a2 = s2.getArea();
if (a1 > a2)
cout << "Circle has larger area (“ << a1 << “) than "
<< "Square(“ << a2 << “)!!" << endl;
else
cout << "Circle has smaller area (“ << a1 << “) than "
<< "Square(“ << a2 << “)!!" << endl;
return 0;
system ("pause");
}
--
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◆ From: 140.112.236.234
1F：推 AlanLee76083:float getarea 沒有return值 10/22 20:01
2F：推 ilway25:"getxxx" function 的意思你有點搞錯了~ 10/22 20:17
3F：→ ilway25:恩還有constructor 10/22 20:18
4F：推 INsoarDEEP:可以麻煩大大解釋一下嗎？我真的不太懂 10/22 20:21
5F：推 ilway25:去翻翻老師上課講義弄懂每一行吧..這很難用一兩行字道盡.. 10/22 20:24
6F：→ ilway25:還有你把老師給的程式碼改了... 10/22 20:26
7F：推 ally01202:getXXX的函數基本上沒有輸入值 10/22 20:46
8F：→ ally01202:所以要用constructer 直接從class裡把變數拿來運算 10/22 20:47
9F：推 nicksxz:補充一點 相同的data不需要重複輸入 10/22 21:12
10F：→ nicksxz:所以有些cin是不需要的 10/22 21:16
11F：→ nicksxz:另外就是cout和return是不一樣的 要分清楚 10/22 21:18
12F：推 ric2k1:嗯, 除了以上各位的回答之外, 簡單的說, 就是你 10/22 21:32
13F：→ ric2k1:Circle::getPerimeter() 不用傳參數, 而是用 constructor 10/22 21:34
14F：→ ric2k1:被呼叫時存入的 data members 就好了 (好像跟上面的人說的 10/22 21:34
15F：→ ric2k1:一樣...) 10/22 21:35
16F：推 INsoarDEEP:感謝大家的指點，我成功COMPILE，程式也能順利跑了， 10/22 23:37
17F：→ INsoarDEEP:原來是有好多基本概念都不清楚，我要加把勁了 10/22 23:39