8-1.c

《C语言程序设计实训》第八章

/*8-1.c*/
#include <stdio.h>
#include <dos.h>
#include <graphics.h>
#include <conio.h>
#include <stdlib.h>
#define INTR 0x1c
void interrupt ( *oldhandler) ();
int fre[]={523,659,587,659,587,494,587,523,440,440,440,330,392,440,494,494,330,415,494,523,523,523};

void interrupt handler(){
unsigned i;
static int flag;
static int k=0;
union{
	long divisor;
	unsigned char c[2];
	}music;
unsigned char port;
flag++;
if (flag>=4){
flag=0;
music.divisor=1190000/fre[k];
outportb(67,182);
outportb(66,music.c[0]);
outportb(66,music.c[1]);
port=inportb(97);
outport(97,port|3);
k++;
if(k>=22) k=1;
}
oldhandler();
}

int main(void)
{
	int gdriver=DETECT,gmode,errorcode;
	int midx,midy,i;
	oldhandler=getvect(INTR);
	setvect(INTR,handler);
	initgraph(&gdriver,&gmode,"c:\\bc\\bin");
	errorcode=graphresult();
	if(errorcode!=grOk)
		{
		printf("graphic error:%s\n",grapherrormsg(errorcode));
		printf("press any key to halt");
		getch();
		exit(1);
		}
		midx=getmaxx()/2;
		midy=getmaxy()/2;
		for(i=SOLID_FILL;i<USER_FILL;i++)
		 {
		 setfillstyle(i,getmaxcolor());
		 bar(midx-50,midy-50,midx+50,midy+50);
		 delay(2000);
		 }
		 getch();
		 closegraph();
		 setvect(INTR,oldhandler);
		 nosound();
		 return(0);
		 }