c++

ROBERT

#include ! x- Q0 H* h2 i+ m: e( Q& T6 F6 cvoid index(int a[];int n;int ⊂) { 5 p9 j5 T! o/ N: V$ X! y& R7 hint i ; for (i=0;i<=n;i++；) {if( a=&sub)&sub=i;} if (i>n)&sub=-1; } 6 w& g/ ?. `" T0 |3 F4 Lvoid main () { int g,i,m,h; printf("数组个数为：\n"); . U5 l; H3 T$ F% b& b# \ scanf("%d",&g); int b[g]; printf("请输入%d个整数：\n",g); 0 H, Z" s9 D$ o, Tfor (i=0;i<=g;i++;) ! A6 v- V. x; [3 S# W4 Hb=scanf("%d",m); printf("要查找的数为：\n"); scanf("%d",&h); index(b[g],g,h); " F/ N9 }# p: U9 Dif(h=-1)printf("该数组中有 %d\n",h); # i! X, G W U- q# P! j# z" `1 R' felse if (h!=-1)printf("该数组中没有 %d\n",h); 7 X# `" z6 a. i( C7 S9 e' V( C}

ROBERT

#include<iostream.h> 5 x+ @* V3 b: \' N$ p8 _8 h( L#include<math.h> double area(double radius=0){ 6 \' y* S/ r6 j! L! L0 edouble s ; s=radius*radius*3.14; return(s); ) x2 e8 @# r0 x3 H9 D5 e) x}

double area(double a=0,double b=0) { double s; ' U- j% n" b9 n- b& ~ s=a*b; & I2 ^5 ^( U8 {8 D' J return(s); # a7 c V4 c1 N } void main(){ double s1,s2,s3,s4,r,a,b; * j( z, w$ h) s" H& D, s cout<<"圆的半径为："; cin>>r; ( ^- d5 i3 t* M" b s1=area(r); cout<<"圆的面积为："<<s1<<endl; cout<<"矩形的长为："; cin>>a; & M' |3 H4 p* B% V* n cout<<"矩形的宽为："; cin>>b; - o: s9 l! c7 D: 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> . L& Y8 c7 f/ Q#include <stdlib.h>

#define PI 3.14 + J8 V4 Z- u) Q$ v: Q6 k/ D5 Eusing namespace std;

class Shape { private: double m_width; u$ w; L5 \" t7 f2 E3 l3 N* V double m_height; 4 q+ j$ @$ t* s9 zpublic: / z4 G; X T6 }" A4 M& M' } Shape(){}; 3 @9 Z# H# ~ {4 z( k6 J ~Shape(){}; , j6 f! p" F9 d r8 q void SetWidth(double w = 0){m_width = w;}; void SetHeight(double h = 0){m_height = h;}; & Y- D/ i6 F4 {( O double GetWidth(void){return m_width;}; + h4 u! ]' ^0 B$ s9 ]* m4 f) P double GetHeight(void){return m_height;}; virtual double GetArea(void) = 0; };

class Rectangle : public Shape 9 L7 Z3 _( w9 J/ A e b{ & m" I* v$ N dpublic: 6 X" F4 S ?8 w Rectangle(){}; : ~) H3 g1 g: e' K0 U ~Rectangle(){}; virtual double GetArea(void){return GetWidth()*GetHeight();}; 7 K% }: |5 \, x- t8 s/ x" f C};

class Circle : public Shape { T/ C7 W! R6 Z2 s( O. o! z+ zpublic: " W8 f( A. p! ]7 h X Circle(){}; 2 m m& A3 a) a/ S$ z$ p ~Circle(){}; * N! ?' v: G4 O" I: N6 X* { virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ 0 K# {. w" k/ ^// 主函数过程 7 ? s. U6 C- W// ------------------------------------------------ $ t2 t- ]0 {, `7 { pint main(int argc, char *argv[]) { 9 G1 A/ x% L$ G Rectangle re;

Circle ci; Shape *p1 = &re,*p2 = &ci; - i8 _0 J* a* g) b! ^# W; {& e& ? re.SetHeight(20); % Z5 a+ W) \+ d# L re.SetWidth(10); ci.SetRadius(12); 3 z: G+ ] `+ m cout << "矩形面积：" << p1->GetArea() << endl; # Q8 H6 l3 S, l, g1 b4 w cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); return 0; % O$ O" A1 o9 Q}