bar3d() function in C graphics

// C Implementation for bar3d() function
#include <graphics.h>

// driver code
int main()
{
    // gm is Graphics mode which is
    // a computer display mode that
    // generates image using pixels.
    // DETECT is a macro defined in
    // "graphics.h" header file
    int gd = DETECT, gm;

    // initgraph initializes the
    // graphics system by loading a
    // graphics driver from disk
    initgraph(&gd, &gm, "");

    // location of sides
    int left, top, right, bottom;

    // depth of the bar
    int depth;

    // top flag denotes top line.
    int topflag;

    // left, top, right, bottom,
    // depth, topflag location's
    bar3d(left = 150, top = 250,
    right = 190, bottom = 350,
    depth = 20, topflag = 1);

    bar3d(left = 220, top = 150,
    right = 260, bottom = 350,
    depth = 20, topflag = 0);

    bar3d(left = 290, top = 200,
    right = 330, bottom = 350,
    depth = 20, topflag = 1);

    // y axis line
    line(100, 50, 100, 350);

    // x axis line
    line(100, 350, 400, 350);

    getch();

    // closegraph function closes the
    // graphics mode and deallocates
    // all memory allocated by
    // graphics system .
    closegraph();

    return 0;
}