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#include "stdafx.h"
#include <stdio.h>
#include <windows.h>
#include <math.h>
#include <conio.h>
typedef struct {
      short int pitch;
      short int duration;
} NOTE;
NOTE notes[] = {{14, 500}, {16, 500}, {12, 500}, {0, 500}, {7, 1000}};
void setfreq(int hz)
{
       hz = 1193180 / hz;      // clocked at 1.19MHz
       _outp(0x43, 0xb6);      // timer 2, square wave
       _outp(0x42, hz);
       _outp(0x42, hz >> 8);
}
void playnote(NOTE note)
{
      _outp(0x61, _inp(0x61) | 0x03);   // start speaker going
      setfreq((int)(400 * pow(2, note.pitch / 12.0)));
      Sleep(note.duration);
      _outp(0x61, _inp(0x61) & ~0x03);  // stop that racket!
}
int main(int argc, char* argv[])
{
     int i;
     HANDLE h;
     h = CreateFile("\\\\.\\giveio", GENERIC_READ, 0, NULL,
     OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
     if(h == INVALID_HANDLE_VALUE)
     {
           printf("Couldn't access giveio device\n");
           return -1;
     }
     for(i=0; i < sizeof(notes)/sizeof(int); ++i)
           playnote(notes[i]);
     CloseHandle(h);
     return 0;
}
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testexternc.cpp
int mytest(void)
{
int a=10,b=20;
int c=a+b;
ret ......

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <semaphore.h>
#define N 2   // Ïû·ÑÕß» ......

C %m.ns Êä³ö

#include <stdio.h>
#define N 19
int main()
{
int i;
for (i=0;i<=N;i++)
{
printf("%*.*s%-*.*s\n",N,i<=N/2?i:N-1,"*******************",\
N,i<=N/2?i+1:N-i+1,"*******************");
}
return 0;
}

%m.ns ......

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