c++

ROBERT

#include 1 m* G3 c1 B: g) k3 Fvoid index(int a[];int n;int ⊂) + P8 b" U+ r& c. a% a{ ' ~) X1 Z9 a5 j, n, _- P7 q8 Rint i ; for (i=0;i<=n;i++；) {if( a=&sub)&sub=i;} if (i>n)&sub=-1; " I# g" w1 y a0 g/ y/ P} 0 ~# K3 [5 l: w4 l . T+ M; `2 Q Jvoid main () { int g,i,m,h; $ B7 }) K6 k# Q; `. i, F printf("数组个数为：\n"); / f# T/ Z( R- O, n8 v' r1 d scanf("%d",&g); ' O' c; B4 h; L/ A9 t. s* Jint b[g]; printf("请输入%d个整数：\n",g); for (i=0;i<=g;i++;) 9 p' A) a/ C: }; zb=scanf("%d",m); 7 @ U5 ^! n% y' ?+ Y. D9 F 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); }

ROBERT

#include<iostream.h> #include<math.h> double area(double radius=0){ [5 O, }3 y2 }5 bdouble s ; $ ]0 L5 [! X/ P8 T$ |+ {s=radius*radius*3.14; return(s); # ?5 @* F! ]/ c2 ?}

double area(double a=0,double b=0) % ^/ Y/ g @( E0 C { + V+ e1 T3 G7 E double s; + X. r, P9 a$ A s=a*b; return(s); $ q' e3 i- r: O0 x K# b3 M1 ] } void main(){ double s1,s2,s3,s4,r,a,b; 1 z; ^' Y; Y; ?( \- F8 o cout<<"圆的半径为："; cin>>r; ! {; r) C2 \3 p2 \$ L& c s1=area(r); cout<<"圆的面积为："<<s1<<endl; & p0 _. k2 a9 `5 h( `, R0 T cout<<"矩形的长为："; cin>>a; cout<<"矩形的宽为："; * h" K7 q7 u) N+ T/ B cin>>b; R# o- B+ c" c; S1 d2 o$ B s2=area(a,b); 8 z; C7 _1 {* T. i+ P9 Vcout<<"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> ! P4 F P; B D. E+ `#include <stdlib.h>

#define PI 3.14 using namespace std;

class Shape 2 y6 N8 K+ Y" H! f{ - w- }6 x1 K6 H2 \8 o$ Oprivate: * d$ j# }6 E3 g8 H( H) x( \' Y H double m_width; double m_height; public: Shape(){}; ~Shape(){}; 9 j. z7 G' N3 h: D5 J C) U void SetWidth(double w = 0){m_width = w;}; # @2 s- ]/ w2 N7 r void SetHeight(double h = 0){m_height = h;}; double GetWidth(void){return m_width;}; ( w: f* i; P) d( L0 p double GetHeight(void){return m_height;}; " x" ]( X4 p' b! `4 l' q virtual double GetArea(void) = 0; * @7 }( t3 h) }};

class Rectangle : public Shape { public: ) ]$ t7 F& V* D4 T# r# H Rectangle(){}; + m* \6 L9 P8 p$ L8 f) s3 j ~Rectangle(){}; # s0 H" p" R1 V9 E( L0 J virtual double GetArea(void){return GetWidth()*GetHeight();}; 3 j/ [; [3 ^4 v};

class Circle : public Shape ) b0 L" e( K. s{ 7 Q( v/ u3 H% O3 D7 m- Gpublic: Circle(){}; ( b j$ `$ n/ P2 U* K0 p ~Circle(){}; ! a& E( R5 r3 Z4 [8 X9 F6 ^ virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; * o1 d& a" ]( ~' q% ^" B% r void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ // 主函数过程 // ------------------------------------------------ int main(int argc, char *argv[]) { Rectangle re;

Circle ci; " j: b: ~! g2 P" w Shape *p1 = &re,*p2 = &ci; re.SetHeight(20); re.SetWidth(10); ci.SetRadius(12); 6 @/ ~" Z( K! m: |; Q) b# Z0 t4 m$ v cout << "矩形面积：" << p1->GetArea() << endl; : p! b+ d t; h6 G! X cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); return 0; }