c++

ROBERT

#include % O- n- J9 W9 Y* _1 ?) E6 T4 }void index(int a[];int n;int ⊂) 1 U1 _) T$ B1 Z* v{ int i ; for (i=0;i<=n;i++；) {if( a=&sub)&sub=i;} if (i>n)&sub=-1; ' ^7 t' A5 L$ a7 K: g3 l V) O$ j} & S/ z4 m& V* E( l2 z' q7 U! E3 u zvoid main () { int g,i,m,h; / b. C3 W/ k# F# M printf("数组个数为：\n"); scanf("%d",&g); + ]8 n) q" L$ U. d3 ?6 z Z: Tint b[g]; 6 K9 h5 C& {4 i r6 gprintf("请输入%d个整数：\n",g); for (i=0;i<=g;i++;) d, h6 x1 f1 }5 _9 eb=scanf("%d",m); printf("要查找的数为：\n"); * n6 |5 t; f4 d8 Y. l9 q& c' M) c' K scanf("%d",&h); : C+ ?7 L, }# f6 pindex(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); 8 h# n( o5 z3 N, m+ V6 }}

ROBERT

#include<iostream.h> 1 ?7 e$ t2 x( }7 v6 K8 ~1 _#include<math.h> double area(double radius=0){ 1 p1 q5 \" s4 S9 B2 y' A6 ndouble s ; s=radius*radius*3.14; : p" x+ ]6 N, G% V0 Treturn(s); }

double area(double a=0,double b=0) { double s; 9 M9 H! Y- h% G& ?5 R6 j s=a*b; " l( E& y N! q' d( O8 B3 @ return(s); 6 J, V+ b# ^7 _6 a/ J1 A* Y } . Y7 f7 l5 V: _- [ n" i* Q4 Q! I5 r' {+ F; d& evoid main(){ , g0 e+ N6 @5 t4 F3 Rdouble s1,s2,s3,s4,r,a,b; # F9 Q" ]2 `. x- s C7 d! N cout<<"圆的半径为："; ; s4 c2 i) R a4 O8 ^: S cin>>r; 0 `$ s' |" I' l2 F/ f% R s1=area(r); cout<<"圆的面积为："<<s1<<endl; cout<<"矩形的长为："; 3 r9 X8 ]# K% ]# _' v3 N! Y1 ~ cin>>a; # V7 l8 t( F0 h3 h cout<<"矩形的宽为："; 6 U/ M1 F: I" D8 w6 C1 { cin>>b; s2=area(a,b); : r3 L9 o& ]- ?8 J2 icout<<"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> + I+ F% I& w3 \+ b8 z4 f#include <stdlib.h>

#define PI 3.14 using namespace std;

class Shape { private: double m_width; double m_height; : i$ d- V5 F- F2 \7 @public: Shape(){}; & ?% A. b/ v: [& i7 `0 l ~Shape(){}; void SetWidth(double w = 0){m_width = w;}; 7 ? R. Q* u* P, f void SetHeight(double h = 0){m_height = h;}; double GetWidth(void){return m_width;}; double GetHeight(void){return m_height;}; - Y8 A) ^& F' b Q0 W) e/ x virtual double GetArea(void) = 0; ) d6 v! e2 P3 c8 h};

class Rectangle : public Shape { public: Rectangle(){}; ~Rectangle(){}; ! f) q5 K: | d, \& ~) R virtual double GetArea(void){return GetWidth()*GetHeight();}; };

class Circle : public Shape { R* O3 D: x+ rpublic: Circle(){}; 1 M" u+ Y: u! h& ?; U2 ` ~Circle(){}; N' ]8 ~( n7 u% U* c# A& p/ { virtual double GetArea(void){return GetWidth()*GetWidth()*PI;}; 0 L3 y6 Q; @+ F4 K* h+ K void SetRadius(double r = 0){SetWidth(r);};

};

// ------------------------------------------------ ( Z/ @+ x' @1 q// 主函数过程 // ------------------------------------------------ int main(int argc, char *argv[]) 9 }* h% J* s- b! k{ 6 O: y1 C5 \/ Q. n4 p4 f Rectangle re;

Circle ci; Shape *p1 = &re,*p2 = &ci; " v( x* g# L( C% B re.SetHeight(20); ! q3 z- b( t1 b2 y: C re.SetWidth(10); 2 ?7 |# H" k( `6 u, [2 {+ b$ a ci.SetRadius(12); # q/ w) T) {- P. D& m: q8 k) K cout << "矩形面积：" << p1->GetArea() << endl; 2 B2 F& n- f3 R4 n% G) E cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); return 0; ' X! d. K7 J' b8 ]}