// vect.cpp -- methods for Vector class
#include <cmath>
#include "vect.h" // includes <iostream>
using std::sqrt;
using std::sin;
using std::cos;
using std::atan2;
using std::cout;
namespace VECTOR
{
const double Rad_to_deg = 57.2957795130823;
// private methods
// calculates magnitude from x and y
void Vector::set_mag()
{
mag = sqrt(x * x + y * y);
}
void Vector::set_ang()
{
if (x == 0.0 && y == 0.0)
ang = 0.0;
else
ang = atan2(y, x);
}
// set x from polar coordinate
void Vector::set_x()
{
x = mag * cos(ang);
}
// set y from polar coordinate
void Vector::set_y()
{
y = mag * sin(ang);
}
// public methods
Vector::Vector() // default constructor
{
x = y = mag = ang = 0.0;
mode = 'r';
}
// construct vector from rectangular coordinates if form is r
// (the default) or else from polar coordinates if form is p
Vector::Vector(double n1, double n2, char form)
{
mode = form;
if (form == 'r')
{
x = n1;
y = n2;
set_mag();
set_ang();
}
else if (form == 'p')
{
mag = n1;
ang = n2 / Rad_to_deg;
set_x();
set_y();
}
else
{
cout << "Incorrect 3rd argument to Vector() -- ";
cout << "vector set to 0\n";
x = y = mag = ang = 0.0;
mode = 'r';
}
}
// set vector from rectangular coordinates if form is r (the
// default) or else from polar coordinates if form is p
void Vector:: set(double n1, double n2, char form)
{
mode = form;
if (form == 'r')
{
x = n1;
y = n2;
set_mag();
set_ang();
}
else if (form == 'p')
{
mag = n1;
ang = n2 / Rad_to_deg;
set_x();
set_y();
}
else
{
cout << "Incorrect 3rd argument to Vector() -- ";
cout << "vector set to 0\n";
x = y = mag = ang = 0.0;
mode = 'r';
}
}
Vector::~Vector() // destructor
{
}
void Vector::polar_mode() // set to polar mode
{
mode = 'p';
}
void Vector::rect_mode() // set to rectangular mode
{
mode = 'r';
}
// operator overloading
// add two Vectors
Vector Vector::operator+(const Vector & b) const
{
return Vector(x + b.x, y + b.y);
}
// subtract Vector b from a
Vector Vector::operator-(const Vector & b) const
{
return Vector(x - b.x, y - b.y);
}
// reverse sign of Vector
Vector Vector::operator-() const
{
return Vector(-x, -y);
}
// multiple vector by n
Vector Vector::operator*(double n) const
{
return Vector(n * x, n * y);
}
// friend methods
// multiply n by Vector a
Vector operator*(double n, const Vector & a)
{
return a * n;
}
// display rectangular coordinates if mode is r,
// else display polar coordinates if mode is p
std::ostream & operator<<(std::ostream & os, const Vector & v)
{
if (v.mode == 'r')
os << "(x,y) = (" << v.x << ", " << v.y << ")";
else if (v.mode == 'p')
{
os << "(m,a) = (" << v.mag << ", "
<< v.ang * Rad_to_deg << ")";
}
else
os << "Vector object mode is invalid";
return os;
}
} // end namespace VECTOR
c++电子书及PPT
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c++电子书及PPT （286个子文件） 
vect.cpp 4KB random.cpp 3KB bank.cpp 3KB brass.cpp 3KB acctabc.cpp 3KB hangman.cpp 3KB string1.cpp 3KB error5.cpp 2KB binary.cpp 2KB stocks.cpp 2KB dma.cpp 2KB workermi.cpp 2KB sayings2.cpp 2KB vect2.cpp 2KB vect3.cpp 2KB queue.cpp 2KB stock1.cpp 2KB use_sales.cpp 2KB stock2.cpp 2KB strngbadfixed.cpp 2KB rtti2.cpp 2KB newplace.cpp 2KB usebrass3.cpp 2KB placenew2.cpp 2KB rtti1.cpp 2KB error4.cpp 2KB usebrass2.cpp 2KB arrfun3.cpp 2KB sayings1.cpp 2KB sales.cpp 2KB studenti.cpp 2KB usealgo.cpp 2KB vslice.cpp 2KB filefunc.cpp 2KB sumafile.cpp 2KB worker0.cpp 2KB setf2.cpp 2KB strquote.cpp 2KB twoswap.cpp 2KB swaps.cpp 2KB leftover.cpp 1KB studentc.cpp 1KB setops.cpp 1KB memb_pt.cpp 1KB winec.cpp 1KB placenew1.cpp 1KB strctfun.cpp 1KB strctptr.cpp 1KB stacktem.cpp 1KB list.cpp 1KB stacker.cpp 1KB tempover.cpp 1KB frnd2tmp.cpp 1KB outfile.cpp 1KB twotemps.cpp 1KB randwalk.cpp 1KB strngbad.cpp 1KB workmi.cpp 1KB pairs.cpp 1KB stkoptr1.cpp 1KB multmap.cpp 1KB tmp2tmp.cpp 1KB ptrstr.cpp 1KB vegnewsfixed.cpp 1KB switch.cpp 1KB vegnews.cpp 1KB append.cpp 1KB mytime3.cpp 1KB functor.cpp 1KB auto.cpp 1KB mytime2.cpp 1KB count.cpp 1KB funadap.cpp 1KB addpntrs.cpp 1KB and.cpp 1KB arrfun2.cpp 1KB external.cpp 1KB cctypes.cpp 1KB stone.cpp 1KB strtype3.cpp 1KB exceed.cpp 1KB tvfm.cpp 1KB lotto.cpp 1KB stonewt1.cpp 1KB strtref.cpp 1KB tv.cpp 1KB use_stui.cpp 1KB use_stuc.cpp 1KB tempmemb1.cpp 1024B static.cpp 1023B listrmv.cpp 1018B nested.cpp 1008B str1.cpp 998B travel.cpp 995B toobig.cpp 981B arrayone.cpp 981B error3.cpp 978B fileio.cpp 976B strtype1.cpp 968B structur.cpp 964B共 286 条
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