c++

ROBERT

#include void index(int a[];int n;int ⊂) { 0 l' b) E; h+ L1 m, ^int i ; for (i=0;i<=n;i++；) ) Q- L. `. ~, j- r{if( a=&sub)&sub=i;} if (i>n)&sub=-1; " Z6 e! L# ]6 \, A} * [/ o5 C4 n N0 n' A3 P ! ] ~/ Q; y5 `- `* ovoid main () { + B7 e0 }8 c- O" [: N int g,i,m,h; 5 f- D- W h+ U, e printf("数组个数为：\n"); scanf("%d",&g); 6 p- m3 E$ U# S h& Q$ M% z4 }5 vint b[g]; printf("请输入%d个整数：\n",g); for (i=0;i<=g;i++;) b=scanf("%d",m); printf("要查找的数为：\n"); scanf("%d",&h); % ^2 L3 n; U% S! Findex(b[g],g,h); if(h=-1)printf("该数组中有 %d\n",h); else if (h!=-1)printf("该数组中没有 %d\n",h); }

ROBERT

#include<iostream.h> #include<math.h> % v4 O* m: |. B double area(double radius=0){ double s ; 0 ?, b1 q6 w5 q4 R$ Ls=radius*radius*3.14; 7 n( ~# @3 i" @7 q% H4 _7 o$ Kreturn(s); ; [& t/ z+ k& H; }}

double area(double a=0,double b=0) , G* M9 y8 Z2 N, ~ { 0 y) s& w& U# z2 ? double s; , i' i C6 x7 G2 k s=a*b; 2 F" }! `% V; q3 ^# Q( N E r- W return(s); * t+ G; q1 f: }, \. T } * ?! i* T" w [7 j, S; C; W void main(){ double s1,s2,s3,s4,r,a,b; % z0 Z2 V" | j' r/ O$ q# O) S& c) u cout<<"圆的半径为："; cin>>r; s1=area(r); : K Q& N. X% M% u9 Acout<<"圆的面积为："<<s1<<endl; cout<<"矩形的长为："; cin>>a; cout<<"矩形的宽为："; 2 [9 |, P& M! i# R cin>>b; . U: u6 k* H6 L s2=area(a,b); cout<<"矩形的面积为："<<s2<<endl;

' P6 |! k& x7 R- ?$ Z9 A: }}

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> , w! p c' s C#include <stdlib.h>

#define PI 3.14 1 h/ x6 j4 @1 g5 C* K% vusing namespace std;

class Shape $ t& z+ K/ C" b1 L& f! v{ 0 M: O$ m, M- b$ K3 j* ]5 Eprivate: double m_width; double m_height; & v% m" w5 A) }6 q2 ?public: " K( _" R- S5 J' e. |& s, o0 m Shape(){}; 6 k( G5 p" S6 }5 z/ e& C ~Shape(){}; void SetWidth(double w = 0){m_width = w;}; void SetHeight(double h = 0){m_height = h;}; double GetWidth(void){return m_width;}; double GetHeight(void){return m_height;}; virtual double GetArea(void) = 0; };

class Rectangle : public Shape { % D% k) N, I$ p* }public: Rectangle(){}; 6 m w# I' r# {% k# F$ v! ? ~Rectangle(){}; & Q, T, j7 Q1 n( m Y0 J3 |) Q+ b) J virtual double GetArea(void){return GetWidth()*GetHeight();}; };

class Circle : public Shape " s: p- G9 F9 P{ 3 ~2 k2 ^5 l( qpublic: Circle(){}; % }& m+ J+ P# h( d8 U! s: V# d& {# | ~Circle(){}; 0 F) d! i3 \4 C4 T8 S virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; ( n) g. N- N r# o5 o: [ I! t8 T void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ // 主函数过程 ' ]" v; i+ J7 a% x2 }" |+ t// ------------------------------------------------ , K/ [( }/ M" K' U) Fint main(int argc, char *argv[]) # W$ D( |3 U1 J' ]{ Rectangle re;

Circle ci; Shape *p1 = &re,*p2 = &ci; ' {) l# b- `5 A( t$ U- U re.SetHeight(20); re.SetWidth(10); ; m) u. Y7 v$ d- Q9 K# ] ci.SetRadius(12); cout << "矩形面积：" << p1->GetArea() << endl; 2 i2 W5 e& z; k4 l: X, B% U( k cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); return 0; : l6 C7 ]) K5 s* `' T. A+ E}