c++

ROBERT

#include void index(int a[];int n;int ⊂) 1 v, _! t! o* Q{ int i ; 5 r3 c! V( @, Y: Ofor (i=0;i<=n;i++；) : g4 a; k- ?: |# p8 ?{if( a=&sub)&sub=i;} 8 J3 B( h5 ?; w# {& I if (i>n)&sub=-1; } s7 F( w7 V/ @& ~ void main () { , J' k- b- E: h# _ int g,i,m,h; ( s7 Z" k5 d5 x printf("数组个数为：\n"); . ^$ _9 F) X9 p) G8 I scanf("%d",&g); int b[g]; 9 B6 }3 f( s: \5 X, [1 @9 l( Mprintf("请输入%d个整数：\n",g); for (i=0;i<=g;i++;) ) Z& `7 Y6 j1 `% E- ?9 P: _0 \b=scanf("%d",m); # w$ \2 c" h# j2 f# N printf("要查找的数为：\n"); scanf("%d",&h); 3 b+ t% U* X: w* m4 Mindex(b[g],g,h); ' ^) E: N8 r6 l# e$ i& F5 d3 @if(h=-1)printf("该数组中有 %d\n",h); ! j* A t/ M% Z9 C8 H: ^else if (h!=-1)printf("该数组中没有 %d\n",h); }

ROBERT

#include<iostream.h> #include<math.h> " ]# S. r8 B4 p" Y4 G d' | double area(double radius=0){ double s ; s=radius*radius*3.14; return(s); }

double area(double a=0,double b=0) ) M5 C$ K" D F) y( t" R" @2 L { double s; ! Y1 A6 P+ y t! p4 O9 |8 W s=a*b; 0 Y- |. m/ U! j# o7 H return(s); } void main(){ + H" v# X1 I" \double s1,s2,s3,s4,r,a,b; # V" M- M+ u3 o h+ d" J; s cout<<"圆的半径为："; cin>>r; s1=area(r); cout<<"圆的面积为："<<s1<<endl; P" k. G6 F- K. c: i0 G3 i3 M3 r cout<<"矩形的长为："; cin>>a; cout<<"矩形的宽为："; cin>>b; s2=area(a,b); 8 {% {8 D" m' p ~' zcout<<"矩形的面积为："<<s2<<endl;

}

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 8 g: W- S1 ^, i& F* z' Uusing namespace std;

class Shape $ L5 E& n. X0 I; x6 }" K{ ; y9 B# l" _$ K3 Z# }5 V0 P; Rprivate: double m_width; double m_height; public: Shape(){}; & Z! N6 M+ @% O2 _/ T3 \6 B ~Shape(){}; 2 c u( E- s: B3 Z) h void SetWidth(double w = 0){m_width = w;}; 9 j. q: D0 F& l9 {( { d- ] void SetHeight(double h = 0){m_height = h;}; double GetWidth(void){return m_width;}; + u( V+ f# o: b. M+ T! d: G% F double GetHeight(void){return m_height;}; : |( ?# R2 |4 G0 c: H virtual double GetArea(void) = 0; };

class Rectangle : public Shape { public: Rectangle(){}; ~Rectangle(){}; virtual double GetArea(void){return GetWidth()*GetHeight();}; };

class Circle : public Shape - Q. o3 ?3 W/ }2 X8 S' \{ ; R, P# b& N, C$ C& dpublic: + X/ L1 B1 }0 R# I* }. } Circle(){}; " z: T e: o$ k% w' U ~Circle(){}; virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; 8 V- r8 t: Z: d# v void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ 3 C3 y7 j4 @+ w; x* {// 主函数过程 / O# I z7 N$ q C! p- u! z// ------------------------------------------------ int main(int argc, char *argv[]) - f7 Q: W7 f$ ]{ 8 Z, Q* l( G# F8 q Rectangle re;

Circle ci; Shape *p1 = &re,*p2 = &ci; . w q0 I# f$ N2 m re.SetHeight(20); re.SetWidth(10); ! e q; _1 ~! {1 a4 _4 N, o ci.SetRadius(12); 6 f3 D7 A3 ^( J/ l$ ^6 i! q cout << "矩形面积：" << p1->GetArea() << endl; & I: P! `& J5 j% Q cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); return 0; }