9-6.c

C语言程序设计实训_源代码

/*9-6.c*/
#include<stdlib.h>
#include<stdio.h>
#include<dos.h>
#include<conio.h>
void main(int argc,char *argv[])
{
FILE *fp;
int rate;
char sound_high[3];
float sound_long;
register int i=0, j ;
int sign=0;
float str[100][2];
if(argc!=2)  /* 命令行参数个数不正确 */ {
  printf("Pararneters Errors! \n") ;
exit(1);
}
if((fp=fopen(argv[1],"r"))==NULL) /*　文件打开失败 */
{
 printf("open file music, doc Errors! \n" );
 exit (1);
}
fscanf(fp,"%d", &rate );  /* 读取音长基数的值　*/
while(!feof(fp)&&!sign ) /* 文件没有结束并且数据还是乐谱 */
{
  fscanf(fp,"%s %f",sound_high,&sound_long); /* 得到音频、音长的数值 */
  str[i][1]=rate*sound_long;  /* 　音乐= 音长基数*节拍数*/
  switch(sound_high[0]) {
   case '*':  /*  最高音 */
switch (sound_high[1]) { /* 确定发音的频率 */
  case '1':
	str[i++][0]=1046.5;
	break;
   case '2':
	 str[i++][0]=1174.7;
	 break;
   case '3':
	 str[i++][0]=1318.5;
	 break;
   case '4':
	 str[i++][0]=1396.9;
	 brcak:
   case '5':
	 str[i++][0]=1568;
	 break;
	case '6':
	str[i++][0]=1760;
	break;
	case '7':
	str[i++][0]=1975.5;
	break;
	default:
	printf ( "\n Errors in music.doc \n" );
	exit(1);
	break;
}
break;
case 'h': /* 高音*/
switch(sound_high[1]) {
case '1':
str[i++][0]=523.3;
break;
case '2':
str[i++][0]=587.3;
break;
case '3':
str[i++][0]=659.3;
break;
case '4':
	 str[i++][0]=698.5;
	 break;
case '5':
   str[i++][0]=784.0;
 break;
case '6':
str[i++][0]=880;
 break;
case '7':
str[i++][0]=987.8;
 break;
default:
   printf("\n Errors in music.doc \n " );
   exit (1);
   break;
}
break;
case 'm': /* 中音 */
  switch(sound_high[1]) {
	case '1':
	 str[i++][0]=262;
	 break;
case '2':
   str[i++][0]=296;
break;
case '3':
   str[i++][0]=329.6;
break;
case '4':
   str[i++][0]=349.2;
break;
case '5':
  str[i++][0]=392;
 break;
case '6':
str[i++][0]=440;
 break;
case '7':
str[i++][0]=493.9;
break;
default:
printf ( "\n Errors in music.doc \n" );
exit(1);
break;
   }
   break;
case 'l': /* 低音 */
  switch(sound_high[1]) {
case '1':
	  str[i++][0]=131;
	break;
	case '2':
	  str[i++][0]=147;
	break;
	case '3':
	str[i++][0]=165;
	break;
	case '4':
	str[i++][0]=176;
	break;
	case '5':
	str[i++][0]=196;
	break;
	case '6':
 str[i++][0]=220;
	break;
	case '7':
 str[i++][0]=247;
	break;
  default:
printf( "\n Errors in music.doc \n " );
exit(1);
break;
}
break;
case '#':
	if(sound_high[1]=='#') sign=1;
	break;
  default:
printf ( "\n Errors in music.doc \n " );
exit (1);
}
}
for(j=0;j<i;j++)
{
sound(str[j][0]); /* 按频率值发出歌曲的音调 */
delay(str[j][1]);
}
nosound(); /* 关闭扬声器 */
}