题目：
修改以下随机漫步者代码，使之将一系列连续的随机漫步者位置写入到文件中。对于每个位置，用不好进行标示。另外，让该程序将初始化条件（目标距离和步长）以及结果小结写入该文件中。该文件的内容如下
test.h
#ifndef STACK_H_
#define STACK_H_
#include <iostream>
namespace VECTOR
{
class Vector
{
public:
enum Mode { RECT, POL };
//RECT直角坐标系，POL极坐标
private:
double x;
double y;
double mag; //长度
double ang; //角度
Mode mode; //打印结果模式
void set_mag();
void set_ang();
void set_x();
void set_y();
public:
Vector();
Vector(double n1, double n2, Mode form = RECT);
void reset(double n1, double n2, Mode form = RECT);
~Vector();
double xval() const{ return x; };
double yval() const { return y; };
double magval() const { return mag; };
double angval() const { return ang; };
void polar_mode();
void rect_mode();
Vector operator+(const Vector& b) const;
Vector operator-(const Vector& b) const;
Vector operator-() const;
Vector operator*(double n) const;
friend Vector operator*(double n, const Vector& a);
friend std::ostream& operator<<(std::ostream& os, const Vector& v);
};
}
#endif
test_function.cpp
#include <cmath>
#include "test.h"
using std::sqrt;
using std::sin;
using std::cos;
using std::atan;
using std::atan2;
using std::cout;
namespace VECTOR
{
const double Rad_to_deg = 45.0 / atan(1.0);
void Vector::set_mag()
{
mag = sqrt(x * x + y * y);
}
void Vector::set_ang()
{
if (x == 0 && y == 0)
{
ang = 0.0;
}
else
ang = atan2(y, x);
}
void Vector::set_x()
{
x = mag * cos(ang);
}
void Vector::set_y()
{
y = mag * sin(ang);
}
Vector::Vector()
{
x = y = mag = ang = 0.0;
}
Vector::Vector(double n1, double n2, Mode form)
{
if (form == RECT)
{
x = n1;
y = n2;
set_mag();
set_ang();
}
else if (form == POL)
{
mag = n1;
ang = n2;
x = y = mag = ang = 0.0;
mode = RECT;
}
}
void Vector::reset(double n1, double n2, Mode form)
{
mode = form;
if (form == RECT)
{
x = n1;
y = n2;
set_mag();
set_ang();
}
else if (form == POL)
{
mag = n1;
ang = n2;
set_x();
set_y();
}
else
{
cout << "Incorrect 3rd argument to Vector() -- ";
cout << "vector set to 0\n";
x = y = mag = ang = 0.0;
mode = RECT;
}
}
Vector::~Vector(){}
void Vector::polar_mode()
{
mode = POL;
}
void Vector::rect_mode()
{
mode = RECT;
}
Vector Vector::operator+(const Vector& b) const
{
return Vector(x + b.x, y + b.y);
}
Vector Vector::operator-(const Vector& b) const
{
return Vector(x - b.x, y - b.y);
}
Vector Vector::operator-() const
{
return Vector(-x, -y);
}
Vector Vector::operator*(double n) const
{
return Vector(n * x, n * y);
}
Vector operator*(double n, const Vector& a)
{
return a * n;
}
std::ostream& operator<<(std::ostream& os, const Vector& v)
{
if (v.mode == Vector::RECT)
{
os << "(x,y) = (" << v.x << ", " << v.y << ")";
}
else if (v.mode == Vector::POL)
{
os << "(m,a) = (" << v.mag << ", " << v.ang * Rad_to_deg << ")";
}
else
{
os << "Vector object mode is invalid";
}
return os;
}
}
test.cpp
#include "test.h"
#include <iostream>
#include <cstdlib>
#include <ctime>
int main()
{
using namespace std;
using VECTOR::Vector;
srand(time(0));
double direction; //角度
Vector step; //记录没次走完的坐标
Vector result(0.0, 0.0);
unsigned long steps = 0;
double target; //距离
double dstep; //步长
cout << "Enter target distance(q to quit): ";
while (cin >> target)
{
cout << "Enter step length: ";
if (!(cin >> dstep))
break;
while (result.magval() < target)
{
direction = rand() % 360;
step.reset(dstep, direction, Vector::POL);
result = result + step;
steps++;
}
cout << "After " << steps << " steps,the subject has the following location:\n";
result.rect_mode();
cout << result << endl;
result.polar_mode();
cout << " or\n" << result << endl;
cout << "Average outward distance per step = " << result.magval() / steps << endl;
steps = 0;
result.reset(0.0, 0.0);
cout << "Enter target distance (q to quit): ";
}
cout << "Bye!\n";
cin.clear();
while (cin.get() != '\n')
continue;
return 0;
}
源代码：
这里主要修改test.cpp文件
test.cpp
#include "test.h"
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <fstream>
int main()
{
using namespace std;
using VECTOR::Vector;
srand(time(0));
double direction; //角度
Vector step; //记录没次走完的坐标
Vector result(0.0, 0.0);
unsigned long steps = 0;
double target; //距离
double dstep; //步长
ofstream of;
of.open("hello.txt");
cout << "Enter target distance(q to quit): ";
while (cin >> target)
{
cout << "Enter step length: ";
if (!(cin >> dstep))
break;
else
{
of << "Target Distance: " << target << " Step Size: " << dstep << endl;
}
while (result.magval() < target)
{
direction = rand() % 360;
step.reset(dstep, direction, Vector::POL);
result = result + step;
result.rect_mode();
of << steps << ": " << result << endl;
steps++;
}
of << "After " << steps << " steps,the subject has the following location:\n";
result.rect_mode();
of << result << endl;
result.polar_mode();
of << " or\n" << result << endl;
of << "Average outward distance per step = " << result.magval() / steps << endl;
steps = 0;
result.reset(0.0, 0.0);
cout << "Enter target distance (q to quit): ";
}
cout << "Bye!\n";
cin.clear();
while (cin.get() != '\n')
continue;
return 0;
}
演示效果：
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