试了一下1986年的“挑战比尔盖茨”编程竞赛
1986年10月3日，微软举办了一场特别的编程竞赛-————“挑战比尔盖茨”。比尔盖茨用QuickBASIC2.0作为编程工具，程序员可以选用任何他们想用的工具。很明显，微软就是在炫耀自己工具的开发效率之高；
题目要求：
创建一个有四个窗口的多线程仿真程序；
第一个窗口显示一个递增数列；
第二个窗口显示一个递增指数数列；
第三个窗口显示一个递增斐波那契额数列；
这三个窗口当显示到敞口底部时要进行显示滚动条或者清除原有数据；
第四个窗口显示一个随机产生大小不一的圆；
30分钟内完成；
当时（1986年）写出一个真正意义上的多线程程序几乎是不可能的。
自己尝试用C语言写了一下，虽然最终完成了功能，但是时间已经远远超过了30分钟。当然如果用C++或者用多线程来编写的话，情况就不一样了。 C代码如下：有兴趣的同学可以复制下来在VC6下编译一下
#include <windows.h>
#include <math.h>
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int cyChar ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("MultiBillGates") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("Multitasking Fake"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
int CheckBottom (HWND hwnd, int cyClient, int iLine)
{
if (iLine * cyChar + cyChar > cyClient)
{
InvalidateRect (hwnd, NULL, TRUE) ;
UpdateWindow (hwnd) ;
iLine = 0 ;
}
return iLine ;
}
/*------------------------------------------------*/
LRESULT APIENTRY WndProc1 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int iNum, iLine, cyClient ;
HDC hdc ;
TCHAR szBuffer[16] ;
switch (message)
{
case WM_SIZE:
cyClient = HIWORD (lParam) ;
return 0 ;
case WM_TIMER:
if (iNum < 0)
iNum = 0 ;
iLine = CheckBottom (hwnd, cyClient, iLine) ;
hdc = GetDC (hwnd) ;
TextOut (hdc, 0, iLine * cyChar, szBuffer,
wsprintf (szBuffer, TEXT ("%d"), iNum++)) ;
ReleaseDC (hwnd, hdc) ;
iLine++ ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
/*------------------------------------------------------*/
LRESULT APIENTRY WndProc2 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int iNum = 1, iLine, cyClient ;
HDC hdc ;
int i, iSqrt ;
TCHAR szBuffer[16] ;
switch (message)
{
case WM_SIZE:
cyClient = HIWORD (lParam) ;
return 0 ;
case WM_TIMER:
do {
if (++iNum < 0)
iNum = 0 ;
iSqrt = (int) sqrt (iNum) ;
for (i = 2 ; i <= iSqrt ; i++)
if (iNum % i == 0)
break ;
}
while (i <= iSqrt) ;
iLine = CheckBottom (hwnd, cyClient, iLine) ;
hdc = GetDC (hwnd) ;
TextOut (hdc, 0, iLine * cyChar, szBuffer,
wsprintf (szBuffer, TEXT ("%d"), iNum)) ;
ReleaseDC (hwnd, hdc) ;
iLine++ ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
/*--------------------------------------------------------*/
LRESULT APIENTRY WndProc3 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int iNum = 0, iNext = 1, iLine, cyClient ;
HDC hdc ;
int iTemp ;
TCHAR szBuffer[16] ;
switch (message)
{
case WM_SIZE:
cyClient = HIWORD (lParam) ;
return 0 ;
case WM_TIMER:
if (iNum < 0)
{
iNum = 0 ;
iNext = 1 ;
}
iLine = CheckBottom (hwnd, cyClient, iLine) ;
hdc = GetDC (hwnd) ;
TextOut (hdc, 0, iLine * cyChar, szBuffer,
wsprintf (szBuffer, TEXT ("%d"), iNum)) ;
ReleaseDC (hwnd, hdc) ;
iTemp = iNum ;
iNum = iNext ;
iNext += iTemp ;
iLine++ ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
/*-----------------------------------------*/
LRESULT APIENTRY WndProc4 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int cxClient, cyClient ;
HDC hdc ;
int iDiameter ;
switch (message)
{
case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
return 0 ;
case WM_TIMER:
InvalidateRect (hwnd, NULL, TRUE) ;
UpdateWindow (hwnd) ;
iDiameter = rand() % (max (1, min (cxClient, cyClient))) ;
hdc = GetDC (hwnd) ;
Ellipse (hdc, (cxClient - iDiameter) / 2,
(cyClient - iDiameter) / 2,
(cxClient + iDiameter) / 2,
(cyClient + iDiameter) / 2) ;
ReleaseDC (hwnd, hdc) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
/*-----------------------------------*/
LRESULT APIENTRY WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HWND hwndChild[4] ;
static TCHAR * szChildClass[] = { TEXT ("Child1"), TEXT ("Child2"),
TEXT ("Child3"), TEXT ("Child4") } ;
static WNDPROC ChildProc[] = { WndProc1, WndProc2, WndProc3, WndProc4 } ;
HINSTANCE hInstance ;
int i, cxClient, cyClient ;
WNDCLASS wndclass ;
switch (message)
{
case WM_CREATE:
hInstance = (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE) ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = NULL ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
for (i = 0 ; i < 4 ; i++)
{
wndclass.lpfnWndProc = ChildProc[i] ;
wndclass.lpszClassName = szChildClass[i] ;
RegisterClass (&wndclass) ;
hwndChild[i] = CreateWindow (szChildClass[i], NULL,
WS_CHILDWINDOW | WS_BORDER | WS_VISIBLE,
0, 0, 0, 0,
hwnd, (HMENU) i, hInstance, NULL) ;
}
cyChar = HIWORD (GetDialogBaseUnits ()) ;
SetTimer (hwnd, 1, 10, NULL) ;
return 0 ;
case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
for (i = 0 ; i < 4 ; i++)
MoveWindow (hwndChild[i], (i % 2) * cxClient / 2,
(i > 1) * cyClient / 2,
cxClient / 2, cyClient / 2, TRUE) ;
return 0 ;
case WM_TIMER:
for (i = 0 ; i < 4 ; i++)
SendMessage (hwndChild[i], WM_TIMER, wParam, lParam) ;
return 0 ;
case WM_CHAR:
if (wParam == '\x1B')
DestroyWindow (hwnd) ;
return 0 ;
case WM_DESTROY:
KillTimer (hwnd, 1) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}