c++

ROBERT

#include void index(int a[];int n;int ⊂) { ( Q: \. A( Q8 u& ~( Iint i ; for (i=0;i<=n;i++；) , F5 V/ N6 Y5 R: z0 h9 f4 I{if( a=&sub)&sub=i;} if (i>n)&sub=-1; 4 [! C1 W* v2 v3 {, q5 n6 j4 l} 0 @% K9 x: T6 M1 g void main () { int g,i,m,h; % ^! J5 n7 |/ u) I7 y/ k+ d/ Y& h printf("数组个数为：\n"); : h5 p: f% y' h( m scanf("%d",&g); int b[g]; 5 T& M7 y: M9 @' p) P! yprintf("请输入%d个整数：\n",g); for (i=0;i<=g;i++;) b=scanf("%d",m); # D. w: n* L) c, w printf("要查找的数为：\n"); ( ?, ]8 Y Y& Z! |2 ~' e* N scanf("%d",&h); * s% h0 K& l) i5 _index(b[g],g,h); ! m/ i: ^- r1 m( p7 w( tif(h=-1)printf("该数组中有 %d\n",h); ! Q1 S1 B# s+ delse if (h!=-1)printf("该数组中没有 %d\n",h); }

ROBERT

#include<iostream.h> 3 n" j6 r, U/ R) n/ G* `( j- I" Y#include<math.h> double area(double radius=0){ ) u2 @$ J. J4 d+ D1 l8 ldouble s ; ) }* H7 y, S! j3 r& X4 k2 os=radius*radius*3.14; return(s); 8 J# H2 j4 k( Y- |9 [) V/ o- q}

double area(double a=0,double b=0) ; S) X: Y, C# W% Y& f u& _ { 6 L0 A8 B4 S: l( Z c1 |! G double s; s=a*b; return(s); 2 e# l0 W' S- ?" {$ a: \ } b) s* l+ c# X : U" r' N2 u4 k6 i) Ovoid main(){ double s1,s2,s3,s4,r,a,b; 2 x% M, a# c$ o0 {# x3 I cout<<"圆的半径为："; 2 L! J. s6 B' a: n* W; j cin>>r; s1=area(r); . c; `- q* A5 l6 S1 m4 pcout<<"圆的面积为："<<s1<<endl; . m8 K' O+ {( n# z% @ }0 p cout<<"矩形的长为："; cin>>a; * p1 M7 Q- r6 }8 ^$ H& F( @4 d cout<<"矩形的宽为："; 6 b$ q. e% M0 i: X3 a2 q cin>>b; 5 w. @7 j* A) H# J s2=area(a,b); ' m0 |* y( D9 Q( T$ G, q$ Ucout<<"矩形的面积为："<<s2<<endl;

# F- H+ X! \1 v5 p* S+ ^/ M}

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> % ^- ~' k) S8 O9 R. K: u, ?#include <stdlib.h>

#define PI 3.14 % }. ]( ~* W' ], [# Xusing namespace std;

class Shape { private: double m_width; 2 d& [# _; Y5 _8 v' m, o double m_height; public: Shape(){}; 7 S$ J. h' X+ [: _: k ~Shape(){}; ; K. j$ B6 I3 r) p8 l void SetWidth(double w = 0){m_width = w;}; void SetHeight(double h = 0){m_height = h;}; ( C# M' W6 Q! V& r7 i double GetWidth(void){return m_width;}; double GetHeight(void){return m_height;}; virtual double GetArea(void) = 0; };

class Rectangle : public Shape ' L, Z3 t- p, @' [{ & j- u9 z4 F- C% N* k# tpublic: Rectangle(){}; ~Rectangle(){}; virtual double GetArea(void){return GetWidth()*GetHeight();}; };

class Circle : public Shape # n+ B9 t1 F- q' N* L{ 5 e$ ^9 e) K+ X; R$ i7 x* H5 e, spublic: Circle(){}; 5 G2 n/ w( w- Y0 R8 l7 u5 l5 A- h ~Circle(){}; virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; % a( \: G; q% t4 B2 v+ B/ ` void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ // 主函数过程 4 Q% Y; Z6 K% d7 r& o8 R// ------------------------------------------------ / r# f8 J' T1 ]int main(int argc, char *argv[]) { 6 I& I, H% Q6 n Rectangle re;

Circle ci; Shape *p1 = &re,*p2 = &ci; : a: d7 t' G8 b; P' F4 J re.SetHeight(20); 9 \- `3 W: ^+ R( ?2 { re.SetWidth(10); + {- I7 `; c. \# ~1 {0 |6 }1 S ci.SetRadius(12); cout << "矩形面积：" << p1->GetArea() << endl; cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); return 0; }