#include <windows.h>
#include <tchar.h>
#include <stdio.h>     int CDECL MessageBoxPrintf (TCHAR * szCaption, TCHAR * szFormat, ……)
{TCHAR   szBuffer [1024] ;va_list pArgList ;// The va_start macro (defined in STDARG.H) is usually equivalent to:// pArgList = (char *) &szFormat + sizeof (szFormat) ;
va_start (pArgList, szFormat) ;// The last argument to wvsprintf points to the arguments
_vsntprintf (szBuffer, sizeof (szBuffer) / sizeof (TCHAR), szFormat, pArgList) ;// The va_end macro just zeroes out pArgList for no good reason
va_end (pArgList) ;return MessageBox (NULL, szBuffer, szCaption, 0) ;
}int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,PSTR szCmdLine, int iCmdShow)
{int cxScreen, cyScreen ;//GetSystemMetrics Api function --(SM_CXSCREEN),(SM_CYSCREEN) return weight and high,in pixles,of the screencxScreen = GetSystemMetrics (SM_CXSCREEN) ;cyScreen = GetSystemMetrics (SM_CYSCREEN) ;MessageBoxPrintf (TEXT ("ScrnSize"), TEXT ("The screen is %i pixels wide by %i pixels high."),cxScreen, cyScreen) ;return 0 ;
}

func( Type para1, Type para2, Type para3, ... )
{/****** Step 1 ******/va_list ap;va_start( ap, para3 ); //一定要“...”之前的那个参数/****** Step 2 ******///此时ap指向第一个可变参数//调用va_arg取得里面的值Type xx = va_arg( ap, Type );//Type一定要相同，如://char *p = va_arg( ap, char *);//int i = va_arg( ap, int );//如果有多个参数继续调用va_arg/****** Step 3 ******/va_end(ap); //For robust!
}

#include   <stdio.h>
#include   <stdarg.h>#define   SAMPLEFOOPARAM2DEFAULT   255
#define   EOL   -1int   samplefoo(int   a,   ……){int   param1,   param2,param3;va_list   num_ptr;param1   =   a;va_start(num_ptr,   a);/*   假定这里的第二个参数是int型，如果没有就用default值   */param2   =   va_arg(num_ptr,   int);if   (   param2     ==   EOL   )param2   =   SAMPLEFOOPARAM2DEFAULT;param3=va_arg(num_ptr,int);if(param3==EOL)param3=SAMPLEFOOPARAM2DEFAULT;va_end(num_ptr);printf("The   first   parameter   of   function   is:   %d\n",   param1);printf("The   first   parameter   of   function   is:   %d\n",   param2);printf("The   first   parameter   of   function   is:   %d\n",   param3);return   0;}int   main(){printf("Output   of   samplefoo(10,   20,   EOL):\n");samplefoo(10,   20,  30,  EOL);   /*   使用的不是缺省值，注意最后的EOL是一个标记值   */printf("Output   of   samplefoo(10,   EOL):\n");samplefoo(10,   EOL,EOL);   /*   使用的不是缺省值，注意最后的EOL是一个标记值   */return   0;}

#include <stdio.h>#include <stdlib.h>void myprintf(char* fmt, ……)        //一个简单的类似于printf的实现，//参数必须都是int 类型

{ char* pArg=NULL;               //等价于原来的va_list char c;pArg = (char*) &fmt;          //注意不要写成p = fmt !!因为这里要对//参数取址，而不是取值
pArg += sizeof(fmt);         //等价于原来的va_start          do{c =*fmt;if (c != '%'){putchar(c);            //照原样输出字符
}else{//按格式字符输出数据switch(*++fmt) {case 'd':printf("%d",*((int*)pArg));           break;case 'x':printf("%#x",*((int*)pArg));break;default:break;} pArg += sizeof(int);               //等价于原来的va_arg
}++fmt;}while (*fmt != '\0'); pArg = NULL;                               //等价于va_endreturn; }int main(int argc, char* argv[]){int i = 1234;int j = 5678;    myprintf("the first test:i=%d\n",i,j); myprintf("the secend test:i=%d; %x;j=%d;\n",i,0xabcd,j); system("pause");return 0;}