今年4月24日，是我国发射第一颗人造地球卫星——“东方红1号”，50周年的纪念日。读了许多纪念文章，耳边仿佛就响起“东方红”的乐曲。忽然想起多年前写过一个演奏乐曲的小程序，它读取经过简单翻译的简谱，然后利用PC机的扬声器演奏出乐曲来。演奏的第一个乐曲就是“东方红”。特地将程序放上来，纪念这个伟大的日子。

当时的想法有点奇怪，并不是直接读谱演奏，而是读谱以后生成另一个源程序，这个派生的源程序将音符和节拍，计算成音频和延时后直接写入代码中，然后才演奏。想不起当时为什么这样做，也许是为了分发最后生成的奏乐执行程序方便吧。现在原文照录。

读谱生成代码的程序：genmusic.cpp.

#include<stdio.h>
#include<string>
#include<windows.h>
using namespace std;class Piccolo {private:int T;  // basic durationDWORD Hz[8]; FILE *sp;    // file to readFILE *tp;    // file to writevoid gennote(int hz,int i,int t)             /* 读简谱生成奏乐文件。 hz代表音符，i代表音调：0为低音，1为正常，2为高音。t代表节拍：1=0.25拍，2=0.5拍，3=0.75拍，4=1拍，以此类推。即t=节拍数x4 */{DWORD dhz,dur;dhz=Hz[hz];dur=60000/T/4*t;       // 调整节拍的时长。if (i==0) dhz=dhz/2;        //低音if (i==2) dhz=dhz*2;        //高音fprintf(tp,"    song.push_back(%d);\n",dhz);fprintf(tp,"    song.push_back(%d);\n",dur);printf("    Beep(%d,%d);\n",dhz,dur);  // print to screen}
public:Piccolo(void){/* 基本音符的频率 */Hz[0]=0;Hz[1]=1300;Hz[2]=1463;Hz[3]=1625;Hz[4]=1733;Hz[5]=1950;Hz[6]=2167;Hz[7]=2438;}void genmusic(string sn){DWORD hz,t,x;string sfn,tfn;sfn=sn+".txt";       // 读入的简谱文件，每个音为一行：第一个为音符，第二为音调，第三为节拍。-1代表结束。tfn=sn+".cpp";       // 产生的奏乐程序。根据简谱计算出频率和延时，产生Beep(hz,duration)函数if (sp=fopen(sfn.c_str(),"r")) {if (tp=fopen(tfn.c_str(),"w")) {fscanf(sp,"%d",&T);          // 首先读入的是节拍的时长。一般100毫秒为一个四分之一拍比较合适cout<<T<<endl; //printf("%d\n",T);fprintf(tp,"#include<stdio.h>\n");    // 写入奏乐程序的包含文件fprintf(tp,"#include<vector>\n");fprintf(tp,"#include<windows.h>\n");fprintf(tp,"using namespace std;\n");fprintf(tp,"int main(void)\n{\n");fprintf(tp,"    vector<DWORD> song;\n");while(!feof(sp)){fscanf(sp,"%d %d %d",&hz,&x,&t);if(hz!=-1) {cout<<hz<<' '<<x<<' '<<t<<endl; //printf("%d%c%d%c%d\n",hz,' ',x,' ',t);gennote(hz,x,t); // 将每个音的音符、音调、节拍写入奏乐程序}else break;}fprintf(tp,"    for(size_t sz=song.size(), i=0; i!=sz; i+=2) {\n      for(int j=0;j<song[i+1];j+=100) printf(\"+\");\n      Beep(song[i],song[i+1]);\n      printf(\"\\n\");\n    }\n");fprintf(tp,"    return 0;\n}");fclose(sp);sp=NULL;fclose(tp);tp=NULL;}else cout<<"Error：file "+tfn+" cannot be created."<<endl; // 在当前目录没有建立文件的权限}else cout<<"Error: file "+sfn+" is not found."<<endl;  // 简谱文件不存在}
};int main(void)
{Piccolo pic;pic.genmusic("dongfanghong");return 0;
}

简谱文件：dongfanghong.txt。第一行是节拍的时长。一般100毫秒为一个四分之一拍比较合适。跟着的就是简谱。每个音为一行：第一个为音符（1、2、3、4、5、6、7），第二为音调（0为低音，1为中音，2为高音），第三为节拍（1=0.25拍，2=0.5拍，3=0.75拍，4=1拍，以此类推）。-1代表结束。

100
5 1 4
2 1 4
1 1 4
7 0 2
6 0 2
5 0 4
5 1 4
2 1 4
3 1 2
2 1 2
1 1 4
1 1 2
6 0 2
2 1 2
3 1 2
2 1 2
1 1 2
2 1 2
1 1 2
7 0 2
6 0 2 
5 0 12
0 1 4
5 1 4
5 1 2
6 1 2
2 1 8
1 1 4
1 1 2
6 0 2
2 1 8
5 1 4
5 1 4
6 1 2
1 1 2
6 1 2
5 1 2
1 1 4
1 1 2
6 1 2
2 1 8
5 1 4
2 1 4
1 1 4
7 0 2
6 0 2
5 0 4
5 1 4
2 1 4
3 1 2
2 1 2
1 1 4
1 1 2
6 0 2
2 1 2
3 1 2
2 1 2
1 1 2
2 1 2
1 1 2
7 0 2
6 0 2
5 0 12
0 1 4
-1 -1 -1 

编译并运行这个genmusic.cpp，生成奏乐程序源文件：dongfanghong.cpp。

#include<stdio.h>
#include<vector>
#include<windows.h>
using namespace std;
int main(void)
{vector<DWORD> song;song.push_back(1950);song.push_back(600);song.push_back(1463);song.push_back(600);song.push_back(1300);song.push_back(600);song.push_back(1219);song.push_back(300);song.push_back(1083);song.push_back(300);song.push_back(975);song.push_back(600);song.push_back(1950);song.push_back(600);song.push_back(1463);song.push_back(600);song.push_back(1625);song.push_back(300);song.push_back(1463);song.push_back(300);song.push_back(1300);song.push_back(600);song.push_back(1300);song.push_back(300);song.push_back(1083);song.push_back(300);song.push_back(1463);song.push_back(300);song.push_back(1625);song.push_back(300);song.push_back(1463);song.push_back(300);song.push_back(1300);song.push_back(300);song.push_back(1463);song.push_back(300);song.push_back(1300);song.push_back(300);song.push_back(1219);song.push_back(300);song.push_back(1083);song.push_back(300);song.push_back(975);song.push_back(1800);song.push_back(0);song.push_back(600);song.push_back(1950);song.push_back(600);song.push_back(1950);song.push_back(300);song.push_back(2167);song.push_back(300);song.push_back(1463);song.push_back(1200);song.push_back(1300);song.push_back(600);song.push_back(1300);song.push_back(300);song.push_back(1083);song.push_back(300);song.push_back(1463);song.push_back(1200);song.push_back(1950);song.push_back(600);song.push_back(1950);song.push_back(600);song.push_back(2167);song.push_back(300);song.push_back(1300);song.push_back(300);song.push_back(2167);song.push_back(300);song.push_back(1950);song.push_back(300);song.push_back(1300);song.push_back(600);song.push_back(1300);song.push_back(300);song.push_back(2167);song.push_back(300);song.push_back(1463);song.push_back(1200);song.push_back(1950);song.push_back(600);song.push_back(1463);song.push_back(600);song.push_back(1300);song.push_back(600);song.push_back(1219);song.push_back(300);song.push_back(1083);song.push_back(300);song.push_back(975);song.push_back(600);song.push_back(1950);song.push_back(600);song.push_back(1463);song.push_back(600);song.push_back(1625);song.push_back(300);song.push_back(1463);song.push_back(300);song.push_back(1300);song.push_back(600);song.push_back(1300);song.push_back(300);song.push_back(1083);song.push_back(300);song.push_back(1463);song.push_back(300);song.push_back(1625);song.push_back(300);song.push_back(1463);song.push_back(300);song.push_back(1300);song.push_back(300);song.push_back(1463);song.push_back(300);song.push_back(1300);song.push_back(300);song.push_back(1219);song.push_back(300);song.push_back(1083);song.push_back(300);song.push_back(975);song.push_back(1800);song.push_back(0);song.push_back(600);for(size_t sz=song.size(), i=0; i!=sz; i+=2) {for(int j=0;j<song[i+1];j+=100) printf("+");Beep(song[i],song[i+1]);printf("\n");}return 0;
}

编译，运行这个dongfanghong.cpp程序，“东方红”的乐曲就奏响了！