c++

ROBERT

#include void index(int a[];int n;int ⊂) ) J7 l- k2 w) L! a+ G7 s1 i" H{ 3 E/ p, f, ?8 x2 A: J1 e! bint i ; for (i=0;i<=n;i++；) & @6 s3 j/ m; n, b, i9 {. V* U{if( a=&sub)&sub=i;} if (i>n)&sub=-1; } * R: Z1 ?9 \6 k5 \; zvoid main () { int g,i,m,h; printf("数组个数为：\n"); scanf("%d",&g); * p+ c4 z- o& l6 Bint b[g]; printf("请输入%d个整数：\n",g); for (i=0;i<=g;i++;) b=scanf("%d",m); printf("要查找的数为：\n"); / y+ B( U5 D+ t: D" [1 ? x, N scanf("%d",&h); . a+ N- C5 i6 w$ sindex(b[g],g,h); - z$ Y* e1 G( fif(h=-1)printf("该数组中有 %d\n",h); & r" |* a( @6 Q# @) [% uelse if (h!=-1)printf("该数组中没有 %d\n",h); / Q! Y" ]& r8 k" f6 q8 C}

ROBERT

#include<iostream.h> 4 N) O9 H& d b' t' ~" \* S0 j ~! e#include<math.h> % P% q& O- ~2 n* {$ B double area(double radius=0){ + W0 G+ l4 l% s) k$ Udouble s ; % M, t3 H4 i4 P. r8 p% v; Us=radius*radius*3.14; 4 d F, ]/ q% b H3 e: B9 Breturn(s); }

double area(double a=0,double b=0) { double s; s=a*b; return(s); } * ?# r6 l! y( i& K, u void main(){ : U8 V% ~- W2 g' j# [5 o6 ^3 ~5 Adouble s1,s2,s3,s4,r,a,b; cout<<"圆的半径为："; , p: L+ j0 p; c cin>>r; s1=area(r); cout<<"圆的面积为："<<s1<<endl; 3 g2 u2 a) t8 A: a cout<<"矩形的长为："; 8 W/ [4 e' I# V2 |, X' ? cin>>a; 3 j! p6 q" B, ~+ p+ M5 Q; k cout<<"矩形的宽为："; 4 C' }* G& N6 \1 P" w: H& E cin>>b; s2=area(a,b); cout<<"矩形的面积为："<<s2<<endl;

& |" [6 v( m( h}

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 5 h: l0 K, n8 G{ private: / s3 m$ O- t. `# {1 P/ t double m_width; 2 R& ]7 H( A$ s/ L1 b double m_height; # M0 u0 }4 ~& e8 n% ?& ] ~8 opublic: Shape(){}; , d7 Z: F2 l4 h9 c) c ~Shape(){}; . j" q% @1 j6 o2 Z5 D void SetWidth(double w = 0){m_width = w;}; void SetHeight(double h = 0){m_height = h;}; 3 |8 \4 E" n6 u double GetWidth(void){return m_width;}; |6 E! V( H- x3 S double GetHeight(void){return m_height;}; virtual double GetArea(void) = 0; + ?8 [( x8 i" B( ~};

class Rectangle : public Shape { ; Q( V1 c! X n& \7 }2 k/ y: `public: * F( K) ?7 k6 c# k/ ~ Rectangle(){}; ~Rectangle(){}; virtual double GetArea(void){return GetWidth()*GetHeight();}; };

class Circle : public Shape - B6 `! J5 L, a6 |% C- H, i{ public: , A# M$ _9 M9 p% A, D9 F Circle(){}; ~Circle(){}; $ X) ^" u6 v6 o1 W: s7 |& I- w virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ . d! j' J9 A/ R: ^! \// 主函数过程 // ------------------------------------------------ int main(int argc, char *argv[]) { Rectangle re;

Circle ci; Shape *p1 = &re,*p2 = &ci; - X3 b- i% e- f* f5 m' e re.SetHeight(20); re.SetWidth(10); + D, k2 } T( [' S2 C ci.SetRadius(12); cout << "矩形面积：" << p1->GetArea() << endl; cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); 5 _ ^$ a( M: {4 Z! R return 0; }