c++

ROBERT

#include ' J, ?" R- d* o7 m5 N2 y: avoid index(int a[];int n;int ⊂) { int i ; for (i=0;i<=n;i++；) 8 X2 p7 E) {) C5 M. o3 x5 p{if( a=&sub)&sub=i;} 5 V5 z+ ?1 S# k+ `/ h# l! ]0 a, `/ r if (i>n)&sub=-1; } ! @' D! r, s! F void main () 0 [8 O2 a* ]. D* t3 R; d( C{ 6 `' r/ X Y3 Y$ z int g,i,m,h; + Q- q4 H2 S5 h9 S1 g printf("数组个数为：\n"); scanf("%d",&g); + G2 E. }9 u! Y- V8 rint b[g]; printf("请输入%d个整数：\n",g); 7 W5 O+ W7 W0 w w5 C4 G/ l! ~5 s3 G0 Cfor (i=0;i<=g;i++;) 8 R$ g/ v- C. X. u6 d1 qb=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); ; ?$ g! Q# Y( z- V1 O, O5 w% a. s}

ROBERT

#include<iostream.h> #include<math.h> double area(double radius=0){ " l6 f) D9 g- C! }. Cdouble s ; s=radius*radius*3.14; : B' B3 ^# U' e6 q3 Hreturn(s); }

double area(double a=0,double b=0) " d, O+ Q. |+ d { double s; s=a*b; return(s); : Q5 Q& _. L% J' R& T, n2 g& H } & m5 K' V+ ~/ b% s; [& ^void main(){ 9 d y9 \: m7 I! k7 F1 j6 rdouble s1,s2,s3,s4,r,a,b; cout<<"圆的半径为："; 7 M* I3 V, Q/ d cin>>r; - K' ^* V3 m+ R% B s1=area(r); 8 F4 y0 V) Y/ d, B# _cout<<"圆的面积为："<<s1<<endl; 1 ~! \" W) ]& I0 D cout<<"矩形的长为："; , Q/ Y( u. d" H3 E* T' E" R cin>>a; cout<<"矩形的宽为："; 7 k3 P9 }: j T+ M" E7 C/ p cin>>b; s2=area(a,b); cout<<"矩形的面积为："<<s2<<endl;

5 S4 e- k: W0 x( `% N: m% t}

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> & } {* N0 d# s#include <stdlib.h>

#define PI 3.14 . `' Y* s3 x" U1 L0 _using namespace std;

class Shape { private: double m_width; double m_height; ; W% W$ S2 n6 t$ Npublic: Shape(){}; : B0 q0 c' l. A2 |; _7 [( y ~Shape(){}; 3 M7 m/ Q! D D# p void SetWidth(double w = 0){m_width = w;}; ! z+ S& [5 y0 v) B- j3 m void SetHeight(double h = 0){m_height = h;}; 7 b7 p7 \+ j# H6 \; e double GetWidth(void){return m_width;}; double GetHeight(void){return m_height;}; . X* {2 ]" |& v( ] virtual double GetArea(void) = 0; };

class Rectangle : public Shape 7 ]# t( v; B2 V{ public: Rectangle(){}; 5 |! @, l" d' c2 S( V: N3 U ~Rectangle(){}; virtual double GetArea(void){return GetWidth()*GetHeight();}; };

class Circle : public Shape ) |8 f2 ]1 T( l1 A( O- a{ 0 l% k* B- v! Y8 i2 F2 ppublic: Circle(){}; ~Circle(){}; 8 q7 U0 e& Q6 V3 U- I virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ ' Z; T7 ]4 Z7 D$ b// 主函数过程 // ------------------------------------------------ , n1 n0 z8 E- Y cint main(int argc, char *argv[]) { , h3 [( N* X+ T( q+ P9 x/ t# ^ Rectangle re;

Circle ci; 8 M# l9 M3 h$ _. P3 B/ i1 J0 y6 L Shape *p1 = &re,*p2 = &ci; re.SetHeight(20); $ S1 K) g& ~* V) U* `0 ~3 t5 ^% Z re.SetWidth(10); $ r, ^9 k/ k# S- @ ci.SetRadius(12); cout << "矩形面积：" << p1->GetArea() << endl; cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); ! k- [4 B; }$ s. A+ Y: O& @. M( B( {. J return 0; 6 n, b2 { R- f% S4 y2 @: J4 i}