c++

ROBERT

#include % a& ]7 t7 ?/ u7 \/ Z3 Zvoid index(int a[];int n;int ⊂) { int i ; 0 j7 l0 y! U% l5 Z8 afor (i=0;i<=n;i++；) {if( a=&sub)&sub=i;} / r# V0 n5 ], f. I1 T% O) ] if (i>n)&sub=-1; * _2 |+ J! g9 V8 t( L, ~; `, v* g} void main () # C& \+ t5 X: ]( v n{ int g,i,m,h; printf("数组个数为：\n"); scanf("%d",&g); - A5 F0 t& G' X) s9 w& b; ^int b[g]; $ k7 |7 d6 k$ t6 s' H+ @5 c' sprintf("请输入%d个整数：\n",g); for (i=0;i<=g;i++;) ) D, L2 {! a' u7 F' |- Qb=scanf("%d",m); printf("要查找的数为：\n"); scanf("%d",&h); " q) R5 F, ?+ \; uindex(b[g],g,h); + x4 b* m* A; b; ]; g: W( Bif(h=-1)printf("该数组中有 %d\n",h); % Z1 {7 i1 `! _, G$ f# O# s( Uelse if (h!=-1)printf("该数组中没有 %d\n",h); }

ROBERT

#include<iostream.h> #include<math.h> double area(double radius=0){ $ e" D9 P! g R( ~double s ; s=radius*radius*3.14; 0 P* u3 p! Q" \. g8 s# s8 sreturn(s); 1 @# f% k0 ^: _0 l5 B}

double area(double a=0,double b=0) $ H* L9 J/ J1 v: O! P0 L) \( m( [5 g { double s; . J6 m+ s1 ^0 E0 y9 m- _. {& ` s=a*b; - r. |- o/ i" n1 ~8 `) W1 j- ]9 \ return(s); 9 Q) v; n5 S9 t& C J6 O. D } # }( j# C* z7 n* l $ H, Y2 ?4 t& {" Gvoid main(){ * w, h! @# |$ L. F. s* e4 cdouble s1,s2,s3,s4,r,a,b; q% W% p: P6 | Y9 I cout<<"圆的半径为："; cin>>r; 3 N0 h" H1 n6 E$ t/ ~/ h R! W s1=area(r); # w, X4 P' E& \, l" A- l" _& V0 \0 Jcout<<"圆的面积为："<<s1<<endl; 2 E |4 J. ?( v4 V( M/ a6 J$ f) ? cout<<"矩形的长为："; 6 w: I8 A. E! O# J" b4 C cin>>a; cout<<"矩形的宽为："; ( I4 w/ R/ `. m- u7 e" m; i cin>>b; s2=area(a,b); " H) M" Z0 V* X- T0 m; Hcout<<"矩形的面积为："<<s2<<endl;

* \3 \' q8 W, [$ _}

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> , i6 P4 t, \- s a' o s0 U#include <stdlib.h>

#define PI 3.14 using namespace std;

class Shape * K j0 }. e6 y{ private: double m_width; double m_height; public: Shape(){}; ~Shape(){}; - @" C0 O! }% A+ U/ J \* `7 _ void SetWidth(double w = 0){m_width = w;}; " T/ F- O6 @( R/ A: | void SetHeight(double h = 0){m_height = h;}; double GetWidth(void){return m_width;}; double GetHeight(void){return m_height;}; ( a u& a7 }3 \ virtual double GetArea(void) = 0; 9 Y, t2 V! R+ |. C};

class Rectangle : public Shape { . U3 C" b- F5 V4 Cpublic: / X( D, f% L# S$ [' m Rectangle(){}; ~Rectangle(){}; / W$ p3 y3 A& g virtual double GetArea(void){return GetWidth()*GetHeight();}; 1 Y+ _3 D3 V) e& o};

class Circle : public Shape { , R i$ r7 P8 zpublic: 5 X& W9 a& C* C& b Circle(){}; ~Circle(){}; virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; + |! }% v4 h$ L: O+ F void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ 4 s$ ^" X& j* _// 主函数过程 // ------------------------------------------------ int main(int argc, char *argv[]) 3 v% \2 T+ C7 g. ~9 V* N# F{ # U) X, F( m; e3 A. a' W; G Rectangle re;

Circle ci; Shape *p1 = &re,*p2 = &ci; 8 \3 K% N% D% B re.SetHeight(20); ; P9 A# K* @9 X* _ re.SetWidth(10); ci.SetRadius(12); $ P5 b5 J5 M% }- Z1 P4 S cout << "矩形面积：" << p1->GetArea() << endl; cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); / O1 A- i; [6 D- k5 R return 0; 2 N5 |4 b! d1 R: X# ^}