c++

ROBERT

#include 9 |; U7 i) a/ }3 nvoid index(int a[];int n;int ⊂) { int i ; 5 D1 |. _/ H, w1 q, d, v2 Rfor (i=0;i<=n;i++；) {if( a=&sub)&sub=i;} - z' m7 y) |, X1 L. u; X if (i>n)&sub=-1; 1 I& |' @9 G1 R, b} 2 H1 w7 ]9 d* S" [ void main () { int g,i,m,h; printf("数组个数为：\n"); scanf("%d",&g); & o3 q2 k V$ N& H1 O8 }8 e% pint b[g]; printf("请输入%d个整数：\n",g); for (i=0;i<=g;i++;) * C5 j" Y2 H/ s7 P$ V$ Xb=scanf("%d",m); " M# R( S# a4 s' Z6 z0 o printf("要查找的数为：\n"); scanf("%d",&h); index(b[g],g,h); 9 f8 W5 k* B3 S" Lif(h=-1)printf("该数组中有 %d\n",h); + O3 S2 f' [) [5 m" l+ felse if (h!=-1)printf("该数组中没有 %d\n",h); ) C4 C- A# V5 w}

ROBERT

#include<iostream.h> #include<math.h> double area(double radius=0){ : c; ]9 x/ o( j- Qdouble s ; s=radius*radius*3.14; return(s); }

double area(double a=0,double b=0) { double s; 8 q& D: k# z$ O( u s=a*b; . V4 H$ P! S( u6 L& W# a return(s); } : W( r% ^# `: I% e8 p void main(){ double s1,s2,s3,s4,r,a,b; 1 ~5 p9 M' P+ y! ~, s! x! t7 V cout<<"圆的半径为："; 2 j i, T: v* G/ M2 ` cin>>r; 0 V/ g# x! M, t s1=area(r); cout<<"圆的面积为："<<s1<<endl; cout<<"矩形的长为："; cin>>a; 7 Q* l4 a- q! P cout<<"矩形的宽为："; cin>>b; s2=area(a,b); cout<<"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 using namespace std;

class Shape { $ [8 o# B* r. l- g) u( `5 bprivate: ( @8 C2 A- u5 A7 q- c* x! q2 d double m_width; double m_height; public: Shape(){}; ~Shape(){}; 8 _: B9 Z v9 p' G 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;}; virtual double GetArea(void) = 0; };

class Rectangle : public Shape 7 b9 w2 R+ [! i{ $ w- I7 g8 j+ W8 \2 x+ Spublic: 2 ?2 F3 {$ B; M9 k6 P& B: Y Rectangle(){}; / @* [, b+ J2 Z ~Rectangle(){}; 9 e, }; }4 c$ X! w0 O+ { virtual double GetArea(void){return GetWidth()*GetHeight();}; };

class Circle : public Shape ! C! [) Y! f/ C6 D0 c{ $ h! B9 B6 X+ h; ]public: Circle(){}; ~Circle(){}; 4 h+ v7 ~2 ]4 R3 U virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; ( T6 {& q. p: ^3 G void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ & w- [6 w5 k6 W) ^& H1 f// 主函数过程 // ------------------------------------------------ int main(int argc, char *argv[]) 5 k5 G7 F# L. K R$ Q1 P{ Rectangle re;

Circle ci; ! \% N5 ^5 v# p3 N7 S i9 @, L Shape *p1 = &re,*p2 = &ci; re.SetHeight(20); re.SetWidth(10); - R. N8 Y/ n2 n# V- H/ ^* t ci.SetRadius(12); cout << "矩形面积：" << p1->GetArea() << endl; cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); ' T( u9 }( {# A" [5 ` return 0; }