c++

ROBERT

#include void index(int a[];int n;int ⊂) ) H: o4 c( J. g0 q{ # f z$ Y, h' ?2 v5 zint i ; Q) k7 i7 K3 O5 ?" A2 T5 tfor (i=0;i<=n;i++；) : s" \( j+ k' t7 v7 X0 T# {{if( a=&sub)&sub=i;} if (i>n)&sub=-1; / e' ?! x- S6 }1 T3 f7 w9 e) J} void main () ( e$ H: e2 U Y/ }: ^{ int g,i,m,h; 9 c* _5 `; d' I# Z4 B( z5 i: }# [ printf("数组个数为：\n"); scanf("%d",&g); # w: G( s& q* aint b[g]; printf("请输入%d个整数：\n",g); for (i=0;i<=g;i++;) ! ? z; f( C9 U( g8 K; A& @b=scanf("%d",m); printf("要查找的数为：\n"); scanf("%d",&h); index(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); 1 g1 p( E! S7 T* u0 k+ E3 s}

ROBERT

#include<iostream.h> * _4 _, |0 f: \) O#include<math.h> 9 H1 S. p: j* F! C/ Q2 c double area(double radius=0){ / d4 c3 k7 z9 Z, g" @7 ?# ~" e3 gdouble s ; s=radius*radius*3.14; return(s); }

double area(double a=0,double b=0) 5 o ~ M. i3 D# l { : N7 r: b* q4 e0 k8 u* @. K4 B- W double s; s=a*b; return(s); } 2 y, w9 l- Y j' X* Kvoid main(){ [/ W- h- |6 Idouble s1,s2,s3,s4,r,a,b; / g6 E. x2 v4 z V$ ~ m; w cout<<"圆的半径为："; - X2 _: j) e3 t/ y6 W cin>>r; s1=area(r); ; H# G4 j3 V! ~* h- ecout<<"圆的面积为："<<s1<<endl; cout<<"矩形的长为："; ; P( P; G ~7 Z cin>>a; & n+ E& P# x" m; \0 L cout<<"矩形的宽为："; 5 [1 V; [' Z3 i2 L$ d" G cin>>b; , L2 N1 ]# ^ X# H! m+ \ s2=area(a,b); * K- q, D8 r; I2 Q; ^cout<<"矩形的面积为："<<s2<<endl;

+ q9 m/ R! u; T% U}

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> #include <stdlib.h>

#define PI 3.14 3 @1 n. ?; F. `) w. iusing namespace std;

class Shape ; ^& K y1 z6 m( T/ e3 K9 c{ private: double m_width; 6 Z2 w6 x& S8 ]& [ double m_height; ) a: E2 p, a& H0 E0 Z& Z, `2 hpublic: + C# I4 ~9 ]6 S$ d; f: D$ U Shape(){}; ~Shape(){}; void SetWidth(double w = 0){m_width = w;}; void SetHeight(double h = 0){m_height = h;}; double GetWidth(void){return m_width;}; H9 V* G N/ r5 A6 ^9 a8 M double GetHeight(void){return m_height;}; virtual double GetArea(void) = 0; };

class Rectangle : public Shape { 2 }; R+ r! o; Q# C- z4 F. {public: Rectangle(){}; 0 S8 e2 Z* i+ M5 v ~Rectangle(){}; # h4 U& w2 U# a% Z2 V* S! | virtual double GetArea(void){return GetWidth()*GetHeight();}; ' d7 b" r9 Y: _! w N};

class Circle : public Shape { public: Circle(){}; ~Circle(){}; virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; + N' r1 j. K$ n' Y" K void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ X$ z4 \8 o$ d) ?0 H! w// 主函数过程 // ------------------------------------------------ 4 Z9 W) H+ g0 \% d' c2 d, zint main(int argc, char *argv[]) { " V, z- I' }' u Rectangle re;

Circle ci; ; S, d8 |( p& v6 R8 r6 J+ J0 r Shape *p1 = &re,*p2 = &ci; 6 ` R8 J9 Y# t+ c1 K4 q 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; , l9 S9 X0 }' a- H' `}