C Language Settings console background color and foreground color __c language

#include <stdlib.h>
int main ()
{
System ("COLOR 3 a");
System ("pause");
return 0;
}
Explain the color behind 3 is the background color code A is the front color code, you can change according to these codes

0= Black
1= Blue
2= Green
3= Lake Blue
4= Red
5= Purple
6= Yellow
7= White
8= Gray
9= Light Blue
A= Light Green
b= Light Green
c= Light Red
d= Lavender
E= Light Yellow

f= Bright White

#include "stdafx.h"

#ifdef WIN32
#include <Windows.h>
#endif

#include <time.h>
# Include <stdlib.h>
#include <string.h>

int _tmain (int argc, _tchar* argv[])
{while
	(1)
	{
		Srand (Time (NULL));
		int _nprecolorflag = rand ()%;
		int _nbackcolorflag = rand ()% 6;
		char _cbackcolorflag;
		Switch (_nbackcolorflag)
		{case
		0:{_cbackcolorflag = ' A ';
		Case 1:{_cbackcolorflag = ' B ';
		Case 2:{_cbackcolorflag = ' C ';
		Case 3:{_cbackcolorflag = ' D ';
		Case 4:{_cbackcolorflag = ' E ';
		Case 5:{_cbackcolorflag = ' F '; break;}
		}
		Char strcolorformat[256];
		sprintf (Strcolorformat, "Color  %d%c", _nprecolorflag,_cbackcolorflag);
		System (Strcolorformat); 
		printf ("---------console window color show----------------\ n");
		Sleep (1000);
		System ("CLS");
	}
	return 0;
}