C / C++ / MFC

//Create the image list, setting its image size to that of single toolbar
//button, and setting color depth to 256 colors (8 bits) and enabling mask
m_ToolBarImages.Create(16, 15, ILC_COLOR8 | ILC_MASK, 3, 3);<br>

//create a CBitmap and load the toolbar bitmap in it
CBitmap bmp;
bmp.LoadBitmap(IDB_MYTOOLBAR);<br>

//add this bitmap to the image list, the image list will automatically
//divide it into equal parts according to the sizes set above.
//The other color paramter is the mask color which is going to be transparent.
//RGB(192, 192, 192) is the default back ground colors in toolbars, change it 
//if you are using different one
m_ToolBarImages.Add(&bmp, RGB(192, 192, 192));<br>

//now we set this image list to the toolbar and everything is done
m_wndToolBar.GetToolBarCtrl().SetImageList(&m_ToolBarImages);

CString s1="First";
CString s2="Second";

//simulating s1.append(s2, 3)
s1=s1.Left(3) + s2;

struct s_Person
{
	union
	{
		char A[4];

		struct
		{
		char a;
		char b;
		char c;
		char d;
		};

		unsigned int name;
	};
};

s_Person p;
p.a = 'A'; 
p.b = 'B'; 
p.c = 'C'; 
p.d = 'D';
// or ...
p.A[0] = 'A'; 
p.A[1] = 'B'; 
p.A[2] = 'C'; 
p.A[3] = 'D';
// or ...
p.name = 'DCBA'; 

union _Person
{
	char Letters[4];
	int dummy;
} Person[5];

<br />
Person[0].dummy=0x355;<br />

union _Person
{
char Letters[4];    //can save up to 4 characters;
int dummy;          //can save an integer value that takes 4 byte
} Person[5];    //an array of union.

struct s_Person { char   Letter1 : 10, Letter2 : 10, Letter3 : 12; };
struct s_Person { short  Letter1 : 10, Letter2 : 10, Letter3 : 12; };
struct s_Person { int    Letter1 : 10, Letter2 : 10, Letter3 : 12; };
struct s_Person { signed Letter1 : 10, Letter2 : 10, Letter3 : 12; };