vector类

//客户主程序

#include<iostream>
#include"vector.h"
using namespace std;
void main()
{
 vector v1;
 vector v2(1,1,1);
  cout<<v1.abs()<<" "<<v2.abs()<<endl;
}

//vector.h

class vector
{
 float x;
 float y;
 float z;
public:
    vector();
    vector(float,float,float);
    float abs();
};

//vector.cpp

#include<cmath>
#include"vector.h"
vector::vector()
{
 x=0;
 y=0;
 z=0;
}
vector::vector(float a,float b,float c)
{
 x=a;y=b;z=c;
}
float vector::abs()
{
 return sqrt(x*x+y*y+z*z);
}