错误C2143和C2059 - Visual Studio

Question

我的一个朋友传给我这个代码，但是当我尝试用C ++（Visual Studio）编译时，我得到了这个错误，我不知道为什么：

1＆gt; c：\ users \ --- \ documents \ visual studio 2012 \ projects \ cgprojecto \ cgprojecto \ camera.hpp（5）：错误C2143：语法错误：缺少';'在'常数'之前

1＆gt; c：\ users \ --- \ documents \ visual studio 2012 \ projects \ cgprojecto \ cgprojecto \ camera.hpp（5）：error C2059：语法错误：'常数'

#include <stdio.h>
#include <math.h>
#include <GL/glut.h>

float PI = 3.1415926535;
const float g_translation_speed = 0.05;
const float g_rotation_speed = PI/180* 0.2;


class Camera{
    public:
    Camera() { Init(); }
    ~Camera(){}

    void Init(){
        m_yaw = 0.0;
        m_pitch = 0.0;

        SetPos(0, 0, 0);
    }

    void Refresh(){

        // Camera parameter according to x/y for flat, z for height
        m_lx = cos(m_yaw) * cos(m_pitch);
        m_ly = sin(m_pitch);
        m_lz = sin(m_yaw) * cos(m_pitch);

        m_strafe_lx = cos(m_yaw - PI/2);
        m_strafe_lz = sin(m_yaw - PI/2);

        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
        gluLookAt(m_x, m_y, m_z, m_x + m_lx, m_y + m_ly, m_z + m_lz, 0.0,1.0,0.0);

    }

    void SetPos(float x, float y, float z){
        m_x = x;
        m_y = y;
        m_z =z;

        Refresh();
    }

    void GetPos(float &x, float &y, float &z){
        x = m_x;
        y = m_y;
        z = m_z;
    }

    void GetDirectionVector(float &x, float &y, float &z){
        x = m_lx;
        y = m_ly;
        z = m_lz;
    }

    // navigation
    void Move(float incr){
        float lx = cos(m_yaw)*cos(m_pitch);
        //float ly = sin(m_pitch); // we don't move vertically
        float lz = sin(m_yaw)*cos(m_pitch);

        m_x = m_x + incr*lx;
        //m_y = m_y + incr*ly; // we don't move vertically
        m_z = m_z + incr*lz;

        Refresh();
    }

    void Strafe(float incr){
        m_x = m_x + incr*m_strafe_lx;
        m_z = m_z + incr*m_strafe_lz;

        Refresh();
    }

    void Fly(float incr){
        m_y = m_y + incr;

        Refresh();
    }

    void RotateYaw(float angle){
        m_yaw += angle;

        Refresh();
    }

    void RotatePitch(float angle){
        const float limit = 89.0 * PI / 180.0;

        m_pitch += angle;

        if(m_pitch < -limit)
            m_pitch = -limit;

        if(m_pitch > limit)
            m_pitch = limit;

        Refresh();
    }

    void SetYaw(float angle){
        m_yaw = angle;

        Refresh();
    }

    void SetPitch(float angle){
        m_pitch = angle;

        Refresh();
    }

private:
    float m_x, m_y, m_z;   // Position
    float m_lx, m_ly, m_lz; // Direction vector of where we are looking at
    float m_yaw, m_pitch; // Various rotation angles
    float m_strafe_lx, m_strafe_lz; // Always 90 degree to direction vector



};