41测试一个名为recta
gle的矩形类，其属性为矩形的左下角与右上角两个点的坐标，能计算矩形的面积。解：源程序：i
cludeiostreamhclassRecta
glepublicRecta
glei
ttopi
tlefti
tbottomi
trightRecta
gle
i
tGetTopco
stretur
itsTopi
tGetLeftco
stretur
itsLefti
tGetBottomco
stretur
itsBottomi
tGetRightco
stretur
itsRight
voidSetTopi
ttopitsToptopvoidSetLefti
tleftitsLeftleftvoidSetBottomi
tbottomitsBottombottomvoidSetRighti
trightitsRightright
i
tGetAreaco
st
privatei
titsTopi
titsLefti
titsBottomi
titsRightRecta
gleRecta
glei
ttopi
tlefti
tbottomi
trightitsToptopitsLeftleftitsBottombottomitsRightright
i
tRecta
gleGetAreaco
sti
tWidthitsRightitsLefti
tHeightitsTopitsBottomretur
WidthHeight
i
tmai

fRecta
gleMyRecta
gle100205080
i
tAreaMyRecta
gleGetArea
cout