//这个的文件名是:angle.h
#ifndef_ANGLE_H
#define_ANGLE_H
class CAngle
{
private:
double angle_deg;
double angel_rad;
public:
void setAngel(double ang_in_deg);
double getSin();
double getCos();
double getAngel();
};
#endif
//这个的文件名是:angle.cpp
#include<iostream>
#include<math.h>
#include"angle.h"
using namespace std;
const double PI=3.1415926;
void CAngle::setAngel(double ang_in_deg)
{
ang_deg=ang_in_deg;
ang_rad=PI*ang_in_deg/180.0;
}
double CAngle::getSin()
{
return sin(ang_rad);
}
double CAngle::getCos()
{
return cos(ang_rad);
}
double CAngle::getAngel()
{
return ang_rad;
}
void showInfo()
{
cout<<"This is my second C++ program "<<endl;
}
void main()
{
double ang_deg;
CAngle angle;
showInfo();
cout<<"please enter an angle in degree:";
cin>>ang_deg;
angle.setAngel(ang_deg);
cout<<"The sine of "<<ang_deg<<" is "<<angle.getSin()<<endl;
cout<<"The cosine of "<<ang_deg<<" is "<<angle.getCos()<<endl;
}
运行之后,出现:fatal error C1021: invalid preprocessor command 'ifndef_ANGLE_H'
为什么?
1楼的不行啊~会出现更多的问题~