c++

ROBERT

#include / x- d& S) H. Q5 H! Yvoid index(int a[];int n;int ⊂) { int i ; for (i=0;i<=n;i++；) * p7 s( \7 v o- {{if( a=&sub)&sub=i;} if (i>n)&sub=-1; 5 E& ^! L4 x* N6 y} $ [' ]) `, H) j% |# tvoid main () { int g,i,m,h; printf("数组个数为：\n"); * y- S& C/ U. w k scanf("%d",&g); int b[g]; 5 F$ @+ x& I+ jprintf("请输入%d个整数：\n",g); for (i=0;i<=g;i++;) b=scanf("%d",m); & P/ t* T' y! C% p0 m6 l printf("要查找的数为：\n"); scanf("%d",&h); index(b[g],g,h); " l$ l/ L2 i: Q# gif(h=-1)printf("该数组中有 %d\n",h); # K: |6 k( w( d4 z& welse if (h!=-1)printf("该数组中没有 %d\n",h); 9 y, ~- u. s$ J6 ^- X3 H}

ROBERT

#include<iostream.h> #include<math.h> double area(double radius=0){ , j; X# M7 U: \: Jdouble s ; 8 ~& {( B; H$ Q, `* m1 xs=radius*radius*3.14; return(s); 1 t8 m1 |) s1 J}

double area(double a=0,double b=0) { 9 B7 F3 F; I5 C2 N N7 z double s; & x# `$ P' _" M6 Z# z+ t3 } s=a*b; return(s); } 9 D% R: L v6 K/ y4 H void main(){ double s1,s2,s3,s4,r,a,b; ( N+ E& \: f: P0 Y cout<<"圆的半径为："; m/ c! F$ }+ u3 h% \& X5 c9 E cin>>r; 2 L# {4 i7 T5 u$ J' y9 w/ T; M s1=area(r); 5 o# l) g3 C6 n( Bcout<<"圆的面积为："<<s1<<endl; 6 X1 `1 v: A( j6 A cout<<"矩形的长为："; cin>>a; cout<<"矩形的宽为："; # F$ h1 H; g `; H# \ cin>>b; s2=area(a,b); cout<<"矩形的面积为："<<s2<<endl;

}

游侠无极限

？我认为你用的变量太多了……

发这个干什么？

游侠无极限

本来想写个试试，可为什么Dev-cpp会提示我Rectangle未定义？奇怪

VC7就很顺利？

#include <iostream> 4 j! b9 Y- @# |/ B' f. J2 S# j#include <stdlib.h>

#define PI 3.14 using namespace std;

class Shape { ! G: R0 P; I' P1 q0 S9 tprivate: double m_width; double m_height; public: ) Q2 p4 `: N, Z8 |! ^! ? Shape(){}; Z+ L9 l0 t5 O9 T+ ?4 p) _ ~Shape(){}; void SetWidth(double w = 0){m_width = w;}; # N- x W! I& M; E% y void SetHeight(double h = 0){m_height = h;}; double GetWidth(void){return m_width;}; double GetHeight(void){return m_height;}; 7 K3 A2 `, M& _( {6 ^% `0 j0 k A% F% y virtual double GetArea(void) = 0; };

class Rectangle : public Shape ) M: H1 d% j y/ a5 w9 e{ 2 d( v$ X, [. Z: f7 Xpublic: / i' F$ R7 V6 N/ e' m Rectangle(){}; ~Rectangle(){}; - M ~- z" q& X3 `5 h virtual double GetArea(void){return GetWidth()*GetHeight();}; 9 i q# ?( {( s. Y0 Z};

class Circle : public Shape { 1 J3 X# Y/ |, a& rpublic: Circle(){}; ~Circle(){}; virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; 9 ~3 W" n8 l' \; q) o# f1 N Q/ U void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ // 主函数过程 3 R2 E/ s/ s% Q8 ^4 u; |// ------------------------------------------------ 4 k. A4 L/ s% ]6 Cint main(int argc, char *argv[]) { Rectangle re;

Circle ci; 7 q6 A1 }5 p% |1 _ Shape *p1 = &re,*p2 = &ci; 4 ]$ O" u' h2 K$ m! j- ` re.SetHeight(20); re.SetWidth(10); ci.SetRadius(12); cout << "矩形面积：" << p1->GetArea() << endl; cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); return 0; }