C Inheritance

labeledPoint.h

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struct LabeledPoint;

struct LabeledPoint* makeLabeledPoint(double x, double y, char* label);

void setLabel(struct LabeledPoint *lp, char *label);

char* getLabel(struct LabeledPoint *lp);

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labeledPoint.c

======================================================================== 

/* labeledPoint.c */

#include "labeledPoint.h"

#include <stdlib.h>

struct LabeledPoint {

    double x, y;

    char* name;

};

struct LabeledPoint* makeLabeledPoint(double x, double y, char* label) {

    struct LabeledPoint* p = malloc(sizeof(struct LabeledPoint));

    p->x = x;

    p->y = y;

    p->name = name;

    return p;

}

void setLabel(struct LabeledPoint* lp) {

    lp->name = name;

}

char* getLabel(struct LabeledPoint* lp) {

    return lp->name;

}

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main.c

========================================================================

/* main.c */

#include "point.h"

#include "labeledPoint.h"

#include <stdio.h>

int main(int argc, char** argv) {

    struct LabeledPoint* origin = makeLabeledPoint(0.0, 0.0, "origin");

    struct LabeledPoint* lowerLeft = makeLabeledPoint(-1.0, -1.0, "lowerLeft");

    printf("distance = %f\n", getDistance(

        (struct Point*) origin, (struct Point*) lowerLeft));

}