用c语言开发音乐的小示例

*表示最高音
h表示高音
m表示中音
l表示低音
与其控制的音符构成音高，决定发音频率，音高的后面是音长，可以用整数或小数输入以控制时间，但中间必须用空各隔开。
乐谱文件的得最前面是一个整数，白噢是音长基数，一般为300  600 900 1200ms；乐谱文件最后世结束符 “##” ，以表示乐谱文件的结束。
程序对读入的乐谱进行翻译， 确定每个乐音的频率和声长， 每个音的音长=音长基数*节拍数，其中技术是乐谱文件的第一个字符。
由于DOS下用来发声的sound函数只能以频率作为参数，所以要完成音符到频率的翻译，没个音的音频可用以模拟频率值输入。
               音符音频对应图
1    131    1   126     1   123.3   1   1045.5
2    147    2   296     2   587.3   2   1174.7
3    155    3   329.7   3   659.3   3   1318.5
4    176    4   349.2   4   698.0   4   1386,9
5    196    5   392     5   784.0   5   1568.0 
6    220    6   440     6    880     6   1760
7    247    7   493.9   7   987.8   7   1976.5
  

最后通过调用sound()函数来实现发声   使用delay()函数实现延时 
#include<stdio.h>
#include<stdio.h>
#include<dos.h>
void main(int argc,char*argv[])
{
FILE*fp;
int rate;
char sound_high[3];
float sound_long;
register int i=0,j;
float str[100][2];
   
if(argc!=2)
{
    printf("Parameters Errors!\n");
    exit(1)'
}
  if((fp=fopen(argv[1],"r"))==NULL)
{
     printf("Open file music doc Errors!\n");
     exit(1);
  }
  fscanf(fp,"%d",&rate);
  while(!feof(fp)&&!sign)
  {
     fscanf(fp,"%s%f",sound_high,&sound_long);
       str[i][1]=rate*sound_long;
     switch(sound_high[0])
   {
     case'*':
            {
                switch(sound_high[1])
                 {
               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;
                        break;
               case'5': str[i++][0]=1568;
                        break;
               case'6': str[i++][0]=1760;
                        break;
               case'7': str[i++][0]=1975.5;
                        break;
               default:
                        printf("\nError in music doc\n");
                        exit(1);
                  }
                        break;
               }
        case'h':
                {  
                     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]=698.3;
                          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("\nError in music doc\n");
                          exit(1);
                       }
                  break;
                 }
            case'm':
                  {
                      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("\nError in music doc\n");
                            exit(1);
                        }
                         break;
                   }
               case'l':
                   {
                      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(\nErrors in music doc\n);
                             exit(1);
                         }
                         break; 
                     }
                case'#':
                     if(sound_high[1]=='#') sign=1;
                     break;
                default: printf("\nErrors in music doc\n");
                         exit(1);
                      }
                 }
                for(j=0;j<=i-1;j++)
                  {
                      sound(str[j][0]);
                      delay(str[j][1]);
                   }
                  nosound();
                   }