include stdio hstruct circus double电子演示程序.pdfVIP

第一章

面向过程与面向对象思想对比

#includestdio.h

structcircus

{

doublera;

doublex;

doubley;

};

doublearea(circusc)

{

doubles;

s=3.14*c.ra*c.ra;

returns;

}

voidmain()

{

circusctemp;

printf(pleaseinputr:\n);

scanf(%lf,ctemp.ra);

doubles=0.0;

s=area(ctemp);

printf(area=%lf\n,s);

}

#includeiostream.h

classcircus

{

private:

doublera;

doublex;

doubley;

public:

doublearea()

{

doubles;

s=3.14*ra*ra;

returns;

}

voidsetr(doublerr)

{

ra=rr;

}

};

voidmain()

{

circusctemp;

//cinctemp.r;

ctemp.setr(2);

doubles=ctemp.area();

coutsendl;

}

第三章

内联函数效率

(VS.80).aspx

ml

#includeiostream.h

#includewindows.h

#includeiomanip.h

#includestdio.h

inlineintadd()

{

intsum=0;

sum+=100;

returnsum;

}

voidmain()

{

SYSTEMTIMEsys;

GetLocalTime(sys);

printf(%4d/%02d/%02d%02d:%02d:%02d.%03d