Name: Anonymous 2011-04-02 8:27
How do I call an object from the main class in java and c?
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct Shape;
typedef char* (*TellShape)(Shape* shape, char* buf, size_t bufsz);
typedef struct Shape {
TellShape tellshape;
void* data;
};
typedef struct squaredata {
int width, height;
};
void SquareConstructor(Shape* shape, void* params)
{
shape->data = malloc(sizeof(squaredata));
squaredata* p = (squaredata*)shape->data;
p->height = ((int*)params)[1];
p->width = ((int*)params)[0];
}
char* SquareTell(Shape* shape, char* buf, size_t bufsz)
{
squaredata* p = (squaredata*)shape->data;
char buf2[12];
char ret[64];
itoa(p->width, buf2, 10);
ret[0] = 0;
strcat(ret, "Square - Width: ");
strcat(ret, buf2);
strcat(ret, ", Height: ");
itoa(p->height, buf2, 10);
strcat(ret, buf2);
if(strlen(ret) >= bufsz)
return 0;
strcpy(buf, ret);
return buf;
}
void SquareDeconstructor(Shape* shape)
{
free(shape->data);
}
typedef struct circledata {
int radius;
};
void CircleConstructor(Shape* shape, void* params)
{
shape->data = malloc(sizeof(circledata));
circledata* p = (circledata*)shape->data;
p->radius = *((int*)params);
}
char* CircleTell(Shape* shape, char* buf, size_t bufsz)
{
circledata* p = (circledata*)shape->data;
char buf2[12];
char ret[64];
itoa(p->radius, buf2, 10);
ret[0] = 0;
strcat(ret, "Circle - Radius: ");
strcat(ret, buf2);
if(strlen(ret) >= bufsz)
return 0;
strcpy(buf, ret);
return buf;
}
void CircleDeconstructor(Shape* shape)
{
free(shape->data);
}
Shape* ConstructSquare(int width, int height)
{
int params[2];
params[0] = width;
params[1] = height;
Shape* ret = (Shape*)malloc(sizeof(Shape));
ret->tellshape = SquareTell;
SquareConstructor(ret, params);
return ret;
}
void DestroySquare(Shape* square)
{
SquareDeconstructor(square);
free(square);
}
Shape* ConstructCircle(int radius)
{
Shape* ret = (Shape*)malloc(sizeof(Shape));
ret->tellshape = CircleTell;
CircleConstructor(ret, &radius);
return ret;
}
void DestroyCircle(Shape* circle)
{
CircleDeconstructor(circle);
free(circle);
}
int main(int argc, char* argv[])
{
Shape* sq = ConstructSquare(5, 7);
Shape* ci = ConstructCircle(12);
char buf[128];
printf("%s\n", sq->tellshape(sq, buf, 128));
printf("%s\n", ci->tellshape(ci, buf, 128));
getchar();
return 0;
}