c++

ROBERT

#include ; O/ X. }" z* {void index(int a[];int n;int ⊂) { int i ; # z Z; D0 l# B+ K/ j1 `for (i=0;i<=n;i++；) {if( a=&sub)&sub=i;} 1 \4 M2 @5 g( ~4 w* s& e if (i>n)&sub=-1; } 8 T/ w' t h$ H void main () 8 n9 ~2 x9 x9 V2 D7 W{ int g,i,m,h; printf("数组个数为：\n"); 2 ?% a( c) b" q. ^) c* p- l% @ scanf("%d",&g); }+ F4 p6 ^$ m' jint b[g]; ( o% C' W) l/ F2 O+ K( ?4 Eprintf("请输入%d个整数：\n",g); 8 w/ I1 {# m( rfor (i=0;i<=g;i++;) b=scanf("%d",m); printf("要查找的数为：\n"); scanf("%d",&h); index(b[g],g,h); & K3 u& _6 v) R! o+ q5 B1 b4 Wif(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> 8 W8 L3 @# r8 Y8 l#include<math.h> double area(double radius=0){ double s ; . V3 f. E% U8 S/ E9 A2 R, A; _% }s=radius*radius*3.14; ( e! Y2 t; F' \0 i# H2 e9 g7 P: E4 Creturn(s); # C; m: B9 R! P& r! e}

double area(double a=0,double b=0) 6 Q+ T* ]9 c: }/ a1 P* `% k { 1 N O; Q4 K6 y4 Z% e! T! S double s; 1 `4 i. L- A6 D: U0 V9 r; s7 m s=a*b; . g! m/ ~' C+ o b# }2 b return(s); ( e$ T9 h" h& `) s) X. g5 m% j% X } 1 e5 z6 e; c3 b9 C3 w 6 B1 Q. M- J8 dvoid main(){ double s1,s2,s3,s4,r,a,b; ) [* G/ R9 p- S cout<<"圆的半径为："; ! E5 o: ]- x( |+ _8 D! g cin>>r; s1=area(r); 6 ~ ^; y* E3 K& D; P( L; m( \* icout<<"圆的面积为："<<s1<<endl; ( R; L5 v0 n9 [4 c7 c$ y1 o cout<<"矩形的长为："; cin>>a; cout<<"矩形的宽为："; ' Q+ K7 z% R$ _! W) C cin>>b; s2=area(a,b); , b2 l" l8 i8 Kcout<<"矩形的面积为："<<s2<<endl;

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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 { private: double m_width; double m_height; * J$ Y( W, B. q7 ppublic: & K: S. f& o5 d: J, {& z: s% G& q Shape(){}; 3 g& r( n' d, k+ w ~Shape(){}; * F$ w5 c) A5 |' N }- v& m 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; + W# A% U6 ]4 g0 m( L( o};

class Rectangle : public Shape { public: 6 s6 L8 p8 [% f9 E7 d Rectangle(){}; ; T" R$ ?. D" x ~Rectangle(){}; * D% l8 j% x8 x- n% n virtual double GetArea(void){return GetWidth()*GetHeight();}; };

class Circle : public Shape 8 \) k" R5 ^$ F9 r8 T8 S9 T$ Y+ w{ public: w; @3 O8 E/ _6 n9 M7 p Circle(){}; ~Circle(){}; ) ^2 F: q m( K# v' D7 G& l) t 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[]) { 2 d4 [. { i. G. d! [ Rectangle re;

Circle ci; : ?- ]1 E; o! g. Q Shape *p1 = &re,*p2 = &ci; / x" `" [! f% z7 ~2 s4 n7 A re.SetHeight(20); 0 z6 y2 D8 v" x, I re.SetWidth(10); ci.SetRadius(12); 5 @7 {& q! `$ ], r3 Y: b2 X4 k& R" a cout << "矩形面积：" << p1->GetArea() << endl; cout << "圆形面积：" << p2->GetArea() << endl;

system("PAUSE"); ; h6 E! x* }9 W8 t5 M return 0; r A" K/ i! }7 N4 V2 J}