c++

ROBERT

#include void index(int a[];int n;int ⊂) { int i ; % c% E$ n) K/ f6 K' l/ Zfor (i=0;i<=n;i++；) : q6 _, y1 [! D) X6 J+ h3 S# ]{if( a=&sub)&sub=i;} if (i>n)&sub=-1; } void main () { 1 d, P& e( G3 i3 E5 [/ X9 P- U( ^ int g,i,m,h; 7 e* W! V! u1 j4 _; }5 B( j' A/ P/ ? printf("数组个数为：\n"); 4 i( ]4 G1 V( P% c" ~0 ~* } scanf("%d",&g); int b[g]; printf("请输入%d个整数：\n",g); # w3 O- G8 {5 }! Afor (i=0;i<=g;i++;) + h+ m/ s; w) d3 B* G1 ?$ y ~3 Eb=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); ( ?8 {( {* ^( O9 p+ jelse if (h!=-1)printf("该数组中没有 %d\n",h); }

ROBERT

#include<iostream.h> #include<math.h> 8 ~- m' W& s9 _ double area(double radius=0){ 1 M+ {+ C* v) {double s ; 0 ?% M K7 r: u; S: Z! Os=radius*radius*3.14; return(s); }

double area(double a=0,double b=0) 9 Z7 w9 r& u; L2 V1 j. j6 X9 J$ g { ( b) E$ X) M$ B6 L double s; 1 `5 I* G! ~: _5 U( Z s=a*b; . j8 A; h1 Y1 V6 f return(s); 2 X; Z5 ^) w' X2 x$ T' l, h } / G/ j- l* a2 n5 f: y# T3 Svoid main(){ double s1,s2,s3,s4,r,a,b; ! [" A4 B% ^6 W1 i B cout<<"圆的半径为："; cin>>r; ' d6 \+ b" P* l" Y- } s1=area(r); cout<<"圆的面积为："<<s1<<endl; cout<<"矩形的长为："; cin>>a; cout<<"矩形的宽为："; ! i5 x5 w* P3 ~ y# ? cin>>b; s2=area(a,b); cout<<"矩形的面积为："<<s2<<endl;

5 l; H ]$ e- o: r; m9 y}

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 using namespace std;

class Shape , t2 h \: O8 ]' A6 l; V, ?{ 0 N0 A9 W& I# R1 f h- Zprivate: 6 l2 B; g0 e3 X! ~3 f double m_width; / V ~) A# {0 M7 ?) w) i7 F double m_height; 1 x9 O5 ^9 V7 T* C2 k4 Mpublic: Shape(){}; 4 S# `5 ]0 s# x ~Shape(){}; ! J! d8 k) Q, M3 N void SetWidth(double w = 0){m_width = w;}; 6 g, R3 X, p. U' x! [4 H* ^ ] void SetHeight(double h = 0){m_height = h;}; t, f) f! C4 `5 d5 m! y' B double GetWidth(void){return m_width;}; double GetHeight(void){return m_height;}; virtual double GetArea(void) = 0; % @( z2 K( C. H& ?8 U};

class Rectangle : public Shape { ' `5 w0 S8 Y" Q: D4 v5 Gpublic: Rectangle(){}; ~Rectangle(){}; ( Q" }. n* P; _, M' m/ m6 } virtual double GetArea(void){return GetWidth()*GetHeight();}; };

class Circle : public Shape { public: 4 e& O2 D/ O) J- H9 d) ^4 z9 k Circle(){}; ~Circle(){}; virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; v7 ]' \' p" d, l, E void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ ) }6 |: v+ l) x. T, c// 主函数过程 % \- `: i; g1 R1 o; j+ I// ------------------------------------------------ int main(int argc, char *argv[]) ; l- z' ]. F/ p$ M{ " e3 b# c0 ~2 |+ A7 Y$ l+ O3 ? Rectangle re;

Circle ci; / J5 }0 N) }4 L! Y$ r& ? Shape *p1 = &re,*p2 = &ci; : j( Z! e$ D% N; u re.SetHeight(20); 8 A5 }! l+ S! H0 |3 N 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; }