c++编程题.pdf
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４.1 测试一个名为ｒectanｇle 得矩形类,其属性为矩形得左下角与右上角两个点得坐标 ,能计算矩形得面积。
解:
源程序:
#inclｕde 〈ｉostｒeam。h＞
class Rｅｃtanｇｌe
｛
puｂlic:
Ｒeｃtaｎgｌe (ｉnｔ toｐ, int leｆt, ｉnt botｔｏm, int rigｈt);
~Reｃｔanｇle () {}
int GetTop() const { reｔurn itｓTop; }
inｔ ＧetLeｆt() ｃoｎsｔ ｛ rｅtuｒn itsLefｔ; }
int GetＢottom() const ｛ reｔurn itsBｏttom; ｝
ｉnt ＧetRigｈt() ｃonｓt { retuｒn itsRighｔ; }
vｏid SeｔTop(int top) ｛ itsＴｏp = tｏｐ; }
void SetＬefｔ (int left) ｛ ｉｔsLeft = lefｔ; ｝
voiｄ ＳｅtBoｔtom (ｉnt bｏttom) ｛ itsBotｔom = bｏｔtｏm; }
void SeｔＲight (int rigｈt) ｛ itｓＲiｇｈｔ = ｒｉgｈt; ｝
int GeｔAｒea() coｎst;
privatｅ:
iｎt itsTｏp;
iｎｔ iｔｓLeft;
int iｔｓBottom;
int ｉｔsRiｇht;
｝;
Ｒｅctａnglｅ::Rｅctangｌe(iｎt ｔop, int leｆｔ, int boｔｔom, iｎｔ riｇht)
｛
itｓＴop = top;
itsＬeft = left;
itｓBoｔtom = bottom;
itsRight = ｒｉght;
}
iｎt Rｅｃtangｌｅ::ＧetArea() cｏｎst
｛
int Wiｄｔｈ = itsRight－ｉtsLｅft;
iｎt Ｈeight = itｓTop — itsBottｏm;
ｒeturn (Width ＊ Heｉｇht);
}
ｉnt mａin()
{
Rectangle MyReｃtａngｌe (100, 20, 50, 80 );
int Ａｒea = ＭyＲecｔaｎgle、GeｔAｒea();
cout <〈 "Ａrea: " 〈〈 Area <〈 ”\ｎ";
ｒetｕrｎ 0;
｝
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