c++

ROBERT

#include 5 G3 p1 D( t" ]( p' h: F- tvoid index(int a[];int n;int ⊂) { 5 j6 s- x4 n4 N9 b+ j% qint i ; for (i=0;i<=n;i++；) {if( a=&sub)&sub=i;} 1 }' n U- e! Q6 {4 P" B if (i>n)&sub=-1; } void main () { int g,i,m,h; 3 r0 B- I- E" ]: D; P9 N/ x+ c: h: ? printf("数组个数为：\n"); # x" A* d* U8 }- w% \% ~ scanf("%d",&g); int b[g]; printf("请输入%d个整数：\n",g); ( a9 d! B1 S6 _ q7 ~) v9 ^for (i=0;i<=g;i++;) b=scanf("%d",m); 7 s3 o+ B% [# j" `: }8 j% y printf("要查找的数为：\n"); 3 Z: r) d f1 Z0 _0 v scanf("%d",&h); ! h9 ]) H1 |4 m5 K# X* N7 cindex(b[g],g,h); if(h=-1)printf("该数组中有 %d\n",h); ' l( f+ k U2 M9 M" Velse if (h!=-1)printf("该数组中没有 %d\n",h); 0 `* x+ L3 E* Y. w4 l% ^4 L}

ROBERT

#include<iostream.h> #include<math.h> ! y( P4 ~! y9 N6 B- g6 s double area(double radius=0){ " M3 F1 N) Q, _7 S! g, ~6 w" S) y8 |double s ; s=radius*radius*3.14; ) \/ k4 `% O- x1 W& ereturn(s); }

double area(double a=0,double b=0) { double s; s=a*b; - k. l& x) R$ P; z0 Z return(s); ! G3 I, r% |" W1 X' x$ d. s } , ^+ ]( @2 S3 d" W0 ~4 S# I- c void main(){ # S8 R% }# I2 G- W. E1 r3 W# bdouble s1,s2,s3,s4,r,a,b; * ? t$ @) V. B+ y8 \6 ]/ ?: Z( D cout<<"圆的半径为："; cin>>r; s1=area(r); - S2 {/ a/ }3 q! ucout<<"圆的面积为："<<s1<<endl; & ]8 V# T9 Y2 b) B$ w j$ b: { cout<<"矩形的长为："; * }1 Y$ b1 C1 F e4 C/ h" ~7 D+ o cin>>a; 1 y" H9 K! L% Q( K cout<<"矩形的宽为："; P* V4 C2 D( }+ F' x cin>>b; s2=area(a,b); 2 Z* r/ Z) [0 P8 [+ }' Hcout<<"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 { " A+ P+ [- n* J8 u0 x' iprivate: ! i/ K, c/ N, a! ^ double m_width; double m_height; public: Shape(){}; ~Shape(){}; void SetWidth(double w = 0){m_width = w;}; 4 Q) } Z$ x, z" U4 Z void SetHeight(double h = 0){m_height = h;}; , F: U1 G. R6 U3 ]& X double GetWidth(void){return m_width;}; double GetHeight(void){return m_height;}; - S3 n ]% n2 E. }: m8 S. B6 m virtual double GetArea(void) = 0; };

class Rectangle : public Shape { 4 n& _! s% R1 V% B/ q+ ?+ ~6 Fpublic: Rectangle(){}; ) l: C& @8 x8 ` ~Rectangle(){}; & y+ r! U. C+ ]3 o; ^5 C0 W% J9 A virtual double GetArea(void){return GetWidth()*GetHeight();}; };

class Circle : public Shape { public: 6 T4 N: [( h+ Z' ]9 ? Circle(){}; ~Circle(){}; , C+ N; w2 R2 d* \) L1 L0 N6 M/ k. S 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[]) s& v. k7 @+ D8 L# r{ + r# M7 K7 X _& K* M9 i Rectangle re;

Circle ci; Shape *p1 = &re,*p2 = &ci; 6 ]: F; n, Q! W4 y re.SetHeight(20); re.SetWidth(10); ci.SetRadius(12); ' U" q4 ?( P* g6 f$ ` cout << "矩形面积：" << p1->GetArea() << endl; " A- |/ Q9 k8 ?1 P- ^ cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); return 0; # ?: G/ K2 S# s+ s& l' j C}