c++

ROBERT

#include ; ]+ i) Z; ~* I6 W% a+ Avoid index(int a[];int n;int ⊂) { int i ; for (i=0;i<=n;i++；) 1 ~4 Y2 C" v7 A% A4 r2 ^$ `{if( a=&sub)&sub=i;} if (i>n)&sub=-1; } void main () 7 l+ K6 J# C7 S4 s7 k8 a{ Y: E" t' Z b' W, ?! v$ P int g,i,m,h; printf("数组个数为：\n"); scanf("%d",&g); 2 k; N+ Q+ I& G7 wint b[g]; 4 Z t( F% `+ G" ^8 h3 tprintf("请输入%d个整数：\n",g); for (i=0;i<=g;i++;) 4 ~: f; |1 T+ ~2 [9 ?! cb=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); }

ROBERT

#include<iostream.h> #include<math.h> 7 T$ j A; j% T3 y, ] double area(double radius=0){ . u* ?% X- p# J2 ?% J R( ldouble s ; s=radius*radius*3.14; 8 b; L! W8 @' y; S1 J" f* Z; ?/ ]0 Kreturn(s); }

double area(double a=0,double b=0) 4 K% y- I; w# o* I& a { double s; + U0 {1 _0 f* d+ p s=a*b; return(s); } ) i0 a7 O y4 P+ T5 `" I " M' |& \; h" i& Rvoid main(){ double s1,s2,s3,s4,r,a,b; . D8 A2 d2 Z. E* h: X) _6 e: V cout<<"圆的半径为："; 4 s# w8 l+ x$ P: P9 e; D cin>>r; 9 I5 ]! ^" \' O s1=area(r); , y ]2 ]! ~0 Q) o0 Acout<<"圆的面积为："<<s1<<endl; ' Q3 i' [5 w& S: f! i cout<<"矩形的长为："; 3 I9 A% J7 z' \: X, c& L cin>>a; 2 H! o' M# z* Z8 }5 m# T cout<<"矩形的宽为："; cin>>b; s2=area(a,b); cout<<"矩形的面积为："<<s2<<endl;

2 N8 ^( h, A' _9 O W% r}

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 * Z4 z: h: z2 g& A{ " k4 B$ [! _. C0 C# G7 uprivate: # I( L1 @3 f( g double m_width; 1 [, g$ @2 d8 Z& h' C' U1 P double m_height; . i2 C; d1 e6 Z0 q8 ^, rpublic: 4 p" \! z' w3 R" `& Z Shape(){}; S0 H2 H$ f. m/ b7 P* t, s ~Shape(){}; void SetWidth(double w = 0){m_width = w;}; . F! @! l2 O/ p6 j' X i4 [ 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; ; E+ D$ t' d0 Q; c$ R- S: x# @};

class Rectangle : public Shape { public: Rectangle(){}; ~Rectangle(){}; * `( p! c3 Z3 G5 {- |# r- V* T virtual double GetArea(void){return GetWidth()*GetHeight();}; & A" p- R. |. p5 E, D% u4 {# N. q};

class Circle : public Shape { public: 3 ~' c6 N+ J$ C' W- M5 D, @& H Circle(){}; ~Circle(){}; $ N; L/ O1 @) ?0 n: z( `1 { virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; , E# `2 r( X; c void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ _* c0 f! g, ~0 ~7 a* V: ~( m/ L% u// 主函数过程 2 H. y# w, o+ B6 \8 h// ------------------------------------------------ int main(int argc, char *argv[]) { Rectangle re;

Circle ci; Shape *p1 = &re,*p2 = &ci; 6 x0 y/ d6 b5 B, ^( F) W8 { re.SetHeight(20); , {6 ]6 Y' ]& `0 f, s! H# ^9 \ re.SetWidth(10); ci.SetRadius(12); , C s, A1 I6 o A h8 O% g5 r cout << "矩形面积：" << p1->GetArea() << endl; 2 @( w" O, h' P: N; E4 t* ^- _- U cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); return 0; }