运行时总是有问题。帮忙解决一下
/*****************baselength.h**********************/
#ifndef baselength_h
#define baselength_h
class baselength{
public:
baselength(){mm=0;}
baselength(long themm);
virtual double length() const;
protected:
long mm;
static double inches_number;
static double meters_number;
static double yards_number;
static double perches_number;
};
class inches:public baselength{
public:
inches(){baselength();}
inches(double thenumber);
double length() const;
};
class meters:public baselength{
public:
meters(){baselength();}
meters(double thenumber);
double length() const;
};
class yards:public baselength{
public:
yards(){baselength();}
yards(double thenumber);
double length() const;
};
class perches:public baselength{
public:
perches(){baselength();}
perches(double thenumber);
double length() const;
};
#endif
/*****************baselength.h**********************/
/*****************baselength.cpp**********************/
#include "stdafx.h "
#include "baselength.h "
#include <iostream>
using namespace std;
double baselength::inches_number=25.4;
double baselength::meters_number =1000;
double baselength::yards_number=inches_number*36;
double baselength::perches_number =yards_number*5.5;
baselength::baselength(long thenumber)
{
mm=thenumber;
}
double baselength::length () const{
return static_cast <double> (mm);
}
inches::inches(double thenumber)
{
mm=static_cast <long> (thenumber);
}
double inches::length () const{
return mm/inches_number;
}
meters::meters(double thenumber)
{
mm=static_cast <long> (thenumber);
}
double meters::length () const{
return mm/meters_number;
}
yards::yards(double thenumber)
{
mm=static_cast <long> (thenumber);
}
double yards::length ()const {
return mm/yards_number;
}
perches::perches(double thenumber)
{
mm=static_cast <long> (thenumber);
}
double perches::length () const{
return mm/perches_number;
}
/*****************baselength.cpp**********************/
/*****************main.cpp**********************/
#include "stdafx.h "
#include "baselength.h "
#include <iostream>
#include <typeinfo>
#include <string>
using namespace std;
baselength* read()
{
int flag;
long temp;
cout < < "please switch(inches 1,meters 2,yards 3,perches 4,): ";
cin> > flag;
switch(flag){
case 1:
cout < < "please input number: ";
cin> > temp;
return new inches(temp);
case 2:
cout < < "please input number: ";
cin> > temp;
return new meters(temp);
case 3:
cout < < "please input number: ";
cin> > temp;
return new yards(temp);
case 4:
cout < < "please input number: ";
cin> > temp;
return new perches(temp);
default:
cout < < "input error " < <endl;
break;
}
}
int main()
{
baselength* pb[4];
int i;
string s;
for(i=0;i <4;i++)
pb[i]=read();
for(i=0;i <4;i++){
if(typeid(*pb[i])==typeid(inches)) s= "inches ";
else if(typeid(*pb[i])==typeid(meters)) s= "meters ";
else if(typeid(*pb[i])==typeid(yards)) s= "yards ";
else if(typeid(*pb[i])==typeid(perches)) s= "perches ";
cout < <pb[i]-> length < <s < < " " < <pb[i]-> baselength::length () < <endl;
}
for(i=0;i <4;i++)
delete pb[i];
return 0;
}
/*****************main.cpp**********************/
题目的大概意思是：定义一个类baselength，它把长度存储为一个整数值，单位毫米，该类有一个成员函数length(),函数返回一个指定长度的double值。从baselength中派生一些类inches,meters,yards和perches,并重写基类的length 函数，把长度返回为相应单位的double值（1英寸=25.4,1米=1000毫米,1码=36英寸,1杆=5.5码）.定义一个main()函数,读取一系列不同单位的长度,创建相应的派生类对象,把它们的地址存储在baselength*类型的数组中,以毫米和原单位输出每个长度.
在运行时输入四个值后,就终止,,,想了好久都不知道是什么问题,希望大家帮一下忙.急......
[解决办法]
cout < <pb[i]-> length
cout < <pb[i]-> length();
这个你能编译过啊?
问题出在typeid上....
[解决办法]
如果你用的VC.net, 在工程属性的C/C++ 命令行 的附加选项加入 /GR即可
主义编译器的警告, 编译器给的每个警告都要仔细看看, 编译的时候最好坐到无错误 无警告
