c++

ROBERT

#include void index(int a[];int n;int ⊂) { : `( v. x- g% Dint i ; for (i=0;i<=n;i++；) - Y+ m% k: `$ q% Q4 G{if( a=&sub)&sub=i;} if (i>n)&sub=-1; } void main () { 7 X8 ?0 F* J& a, q4 a" X9 J int g,i,m,h; ) |/ }' G5 C, v# s printf("数组个数为：\n"); # p/ V7 d- `: w8 W: l( ]% q9 F scanf("%d",&g); : V4 Z5 Q7 g! ?7 ^1 z# oint b[g]; & p# t# g! y& k# N# c9 p: `printf("请输入%d个整数：\n",g); ( H* A( V/ A$ m" Z8 C+ @/ l: tfor (i=0;i<=g;i++;) b=scanf("%d",m); printf("要查找的数为：\n"); * x I4 ~! [" W7 [/ H6 O& D scanf("%d",&h); : R5 o: Y0 r! b7 o& o. j$ t- Y6 {' V6 Mindex(b[g],g,h); # _5 v+ o9 g6 c8 W) P" v2 [if(h=-1)printf("该数组中有 %d\n",h); 4 m( g7 ~- n# U0 R+ Jelse if (h!=-1)printf("该数组中没有 %d\n",h); , [( ~) }: }2 ~3 V# F* l0 L$ R}

ROBERT

#include<iostream.h> 0 v1 l3 M9 i z0 j5 q0 A6 O#include<math.h> double area(double radius=0){ " F# k+ o5 L1 ], b8 Z( Zdouble s ; s=radius*radius*3.14; + H4 L( i: O9 c; U x! H9 b3 Preturn(s); }

double area(double a=0,double b=0) . m" j% `* h' c! u& G: i8 F { double s; ; P+ Q. q. C4 g; N s=a*b; return(s); } , O6 }; c( K, L9 A$ Z void main(){ 6 O" ?+ U/ e; o+ Y* @: cdouble s1,s2,s3,s4,r,a,b; 1 D2 ~: ~* Z. k4 i$ F: R cout<<"圆的半径为："; cin>>r; " d+ g7 w$ k E3 g+ C s1=area(r); cout<<"圆的面积为："<<s1<<endl; + a. w7 ^$ d) u3 J- g) s6 q cout<<"矩形的长为："; cin>>a; # `; p8 [( c& b4 x cout<<"矩形的宽为："; 0 G1 i7 @" |* w; w. [ cin>>b; s2=area(a,b); 5 ^4 ] N1 D: |- Z) wcout<<"矩形的面积为："<<s2<<endl;

- o9 V2 \: I+ W7 d4 s+ E- n}

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 { private: double m_width; 1 ?3 Z" I: R% d9 H2 v% ] double m_height; public: 2 R* b2 c z+ e. V6 Q, M Shape(){}; ~Shape(){}; void SetWidth(double w = 0){m_width = w;}; void SetHeight(double h = 0){m_height = h;}; double GetWidth(void){return m_width;}; double GetHeight(void){return m_height;}; + K& {+ W4 y6 _* p3 b3 ~ virtual double GetArea(void) = 0; ' w' V# ~; N' c8 | p};

class Rectangle : public Shape * ^. G- k* @* { |{ public: 1 l X/ m. w @4 g4 y( ] Rectangle(){}; ~Rectangle(){}; ; {1 N8 @3 ~8 Y, L virtual double GetArea(void){return GetWidth()*GetHeight();}; - U6 [) I2 }6 J};

class Circle : public Shape ' H. i3 [: ]3 N" \{ ( C7 }* @, T) f# w, {6 r6 Vpublic: Circle(){}; ~Circle(){}; * z- ?; k6 z- I% ?$ d O: n virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ // 主函数过程 // ------------------------------------------------ int main(int argc, char *argv[]) ) a' U- f; _9 @' [1 I! Z0 L{ 1 O1 Z4 D8 [$ e# ? Rectangle re;

Circle ci; " q% [8 [ ?2 b( f Shape *p1 = &re,*p2 = &ci; re.SetHeight(20); 3 t, z+ l1 H; [ re.SetWidth(10); * P* r: }1 \& W6 h$ ?6 r8 j+ L ci.SetRadius(12); cout << "矩形面积：" << p1->GetArea() << endl; cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); return 0; }