vector.cc
author Markus Bröker <mbroeker@largo.dyndns.tv>
Thu, 16 Apr 2009 12:49:13 +0200
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parent 54 c064ce9f40f5
child 74 829976007e62
permissions -rw-r--r--
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/**
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 * DEREFERNCING CLASSES
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 */
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#include <cstdio>
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#include <cstdlib>
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#include <cmath>
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#include <ctime>
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#define GETRANDOM(max) (1+(int)((float)max*rand()/RAND_MAX+1.0))
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#define MAX 6
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static int refCounter = 0;
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namespace algebra {
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    class Vector {
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      private:
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        int x;
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        int y;
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      public:
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        Vector (int xx = 0, int yy = 0);
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        Vector (const Vector &);
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       ~Vector ();
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        int X () { return x; };
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        int Y () { return y; };
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        Vector operator+ (Vector &);
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        Vector operator- (Vector &);
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        void vector ();
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        double abs ();
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    };
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    Vector::Vector (int xx, int yy) {
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        x = xx;
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        y = yy;
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        refCounter++;
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    }
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    Vector::Vector (const Vector & copy)
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    : x (copy.x), y (copy.y) {
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        fprintf (stderr, "Warning Copy Constructor\n");
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        refCounter++;
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    }
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    Vector::~Vector () {
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        fprintf (stderr, "Removing Vector (%.3d, %.3d)\n", x, y);
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        refCounter--;
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    }
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    Vector Vector::operator+ (Vector & v) {
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        return Vector (x + v.X (), y + v.Y ());
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    }
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    Vector Vector::operator- (Vector & v) {
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        return Vector (x - v.X (), y - v.Y ());
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    }
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    double Vector::abs () {
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        return sqrt (x * x + y * y);
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    }
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    void Vector::vector () {
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        printf ("(%.3d, %.3d)", x, y);
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    }
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}
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using namespace algebra;
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int main (int argc, char **argv)
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{
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    Vector **v;
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    Vector result;
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    srand (time (NULL));
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    if ((MAX % 2) != 0) {
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        printf ("MAX %% 2 != 0\n");
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        return EXIT_FAILURE;
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    }
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    v = new Vector *[MAX];
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    for (int i = 0; i < MAX; i++) {
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        v[i] = new Vector (GETRANDOM (100), GETRANDOM (100));
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    }
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    for (int i = 0; i < MAX; i += 2) {
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        v[i + 1]->vector ();
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        printf ("+");
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        v[i]->vector ();
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        printf ("=");
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        result = *v[i + 1] + *v[i];
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        result.vector ();
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        printf (" = %3.2f\n", result.abs ());
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    }
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    printf ("\n");
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    for (int i = 0; i < MAX; i += 2) {
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        v[i + 1]->vector ();
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        printf ("-");
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        v[i]->vector ();
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        printf ("=");
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        result = *v[i + 1] - *v[i];
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        result.vector ();
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        printf (" = %3.2f\n", result.abs ());
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    }
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    for (int i = 0; i < MAX; i++)
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        delete v[i];
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    delete [] v;
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    fprintf (stderr, "Objects remaining on exit: %d\n", refCounter);
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    return EXIT_SUCCESS;
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}