📄 class1.h
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#include <stdlib.h>
#include <stdio.h>
#include <iostream.h>
#include <string.h>
#include <fstream.h>
int flag=0; //标志位
char cch;
char bchar;
char str[100];
FILE *fp;
void Pushback(char c)
{
bchar=c;
flag=1;
}
/////////////////////////////////////////////////////////////////
char GetC()
{
if(flag==1)
{
flag=0;
return bchar;
}
char t;
t=getc(fp);//继续取出字符
if(t=='\n'||t=='\t'||t=='\r') t=' ';
return t;
}
/////////////////////////////////////////////////////////////////////////
int SearchKey() //搜索关键字
{
char StrToken[32][10]={"auto","break","case","char","const",
"continue","default","do","double","else","enum","extern",
"float","for","goto","if","int","long","register","return",
"short","signed","sizeof","static","struct","switch",
"typedef","union","unsigned","void","volatile","while"};
for(int i=0;i<32;i++)
{
if(strcmp(StrToken[i],str)==0) //比较关键字
return i;
}
return 0;
}
///////////////////////////////////////////////////////////////////////////////////
bool OpenFile(char fname[20])//读取文件
{
cout<<"输入文件位置及名称（如: e:\\a.c）:"<<endl;
cin>>fname;
if((fp=fopen(fname,"r"))==NULL)
{
cout<<"文件路径或者文件名不正确导致了文件打开错误!!!"<<endl;
return false;
}
else return true;
}//OpenFile*/
/*void ShowFile() //显示源文件
{
char charfile;
char fname[20];
if( OpenFile(fname) ==true )
{
cout<<"*********************************源程序**********************************"<<endl;
while(charfile!=EOF)
{
cout<<charfile<<endl;
}
fclose(fp);
printf("/n");
}
}//*/
/*bool ReadFile(ifstream& infile)//读取源文件
{
const int MAXLENTH=31;
char SFile[MAXLENTH];
cout<<"输入正确路径和文件名（包括扩展名）:"<<endl;
cin.getline(SFile,MAXLENTH,'\n');
infile.open(SFile,ios::binary);
if(infile.fail())
{
cout<<"The file doesn't exist,Can't open it!"<<endl;
exit(1);
return false;
}
else
{
cout<<"FILE Opened"<<endl;
return true;
}
}//ReadFile*/
bool SaveFile(ofstream& outfile)//保存文件
{
const int MAXLENTH1=31;
char FFile[MAXLENTH1];
cout<<"Please enter a name for final file:"<<endl;
cin.getline(FFile,MAXLENTH1,'\n');
outfile.open(FFile,ios::app);
//cout<<"File has beeen created and opened"<<endl;
//return true;
if(outfile.fail())
{
cout<<"Cann't creat&open file"<<endl;
return false;
}
else
{
cout<<"File has beeen created and opened"<<endl;
return true;
}//*/
}//SaveFile
void CloseFile(char fname[20])
{
fp=fopen(fname,"r");
fclose(fp);
cout<<"文件 "<<fname<<" 已经关闭!"<<endl;
}//CloseFile
////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
void GetNextWord()//处理字符，并且取下一个
{
cch=GetC();
while(cch==' ')// 除去空格
{
cch=GetC();
}
int k=0;
str[0]=cch;
//////////////////////////////////////////////////////////////////////////////////
if((cch>='a'&&cch<='z')||(cch>='A'&&cch<='Z'))//字符是字母
{
str[++k]=cch;//当前字符存入str数组中
cch=GetC();
while((cch>='a'&&cch<='z')||(cch>='A'&&cch<='Z')||(cch>='0'&&cch<='9'))
{
str[k++]=cch;
cch=GetC();
}
str[k]='\0';
Pushback(cch);//是\0的话回退
if(SearchKey()==0)
cout<<"字符（串）:"<<str;
else cout<<"关键字:"<<str;//是关键字的话输出<<SearchKey()
}
//////////////////////////////////////////////////////////////
else if(cch<='9'&&cch>='0')//数字的识别
//else if1
{
while(cch<='9'&&cch>='0')
cch=GetC();
if(cch=='E'||cch=='D')
cch=GetC();
if(cch=='+'||cch=='-')
{
cch=GetC();
if(cch<='9'&&cch>='0')
cch=GetC();
while(cch<='9'&&cch>='0')
cch=GetC();
Pushback(cch);
cout<<"400";
}
else if(cch<='9'&&cch>='0')
{
while(cch<='9'&&cch>='0')
cch=GetC();
Pushback(cch);
cout<<"400";
}
else if(cch=='.')//else if2
{
while(cch<='9'&&cch>='0')
cch=GetC();
if(cch=='E'||cch=='D')
cch=GetC();
if(cch=='+'||cch=='-')
{
cch=GetC();
if(cch<='9'&&cch>='0')
cch=GetC();
while(cch<='9'&&cch>='0')
cch=GetC();
Pushback(cch);
cout<<"400";
}
else if(cch<='9'&&cch>='0')
{
while(cch<='9'&&cch>='0')
cch=GetC();
Pushback(cch);
cout<<"400";
}
else Pushback(cch);
cout<<"400";
}//else if2
}//else if1
////////////////////////////////////////////////////////////////////////////////////////
else //判断运算符
{
switch(cch)
{
case '+':
{
cch=GetC();
switch(cch)
{
case '+':cout<<"1"<<"++";break;
case '-':cout<<"2"<<"+=";break;
default:Pushback(cch);cout<<"3"<<"+";break;
}
};break;
case '-':
{
cch=GetC();
switch(cch)
{
case '-':cout<<"4"<<"--";break;
case '=':cout<<"5"<<"-=";break;
case '>':cout<<"6"<<"->";break;
default:Pushback(cch);cout<<"7"<<"-";break;
}
};break;
case '*':
{
cch=GetC();
switch(cch)
{
case'=':cout<<"12"<<"*=";break;
case'/':cout<<"右注释:"<<"*/";break;
default:Pushback(cch);cout<<"乘法:"<<"*";
}
};break;
case '/':
{
cch=GetC();
switch(cch)
{
case'=':cout<<"除以等于:"<<"/=";break;
case'*':cout<<"左注释:"<<"/*";break;
case'n':cout<<"换行符:"<<"/n";break;
default:Pushback(cch);cout<<"除法:"<<"/";
}
};break;
case '<':
{
cch=GetC();
switch(cch)
{
case'=':cout<<"12"<<"<=";break;
case'<':cch=GetC();
if(cch=='=')cout<<"13"<<"<<=";
else
{
Pushback(cch);
cout<<"14"<<"<<";
};
default:Pushback(cch);cout<<"左尖括号:"<<"<";
}
};break;
case '>':
{
cch=GetC();
switch(cch)
{
case'=':cout<<"16"<<">=";break;
case'>':cch=GetC();
if(cch=='=')cout<<"17"<<">>=";
else
{
Pushback(cch);
cout<<"18"<<">>";break;}
default:Pushback(cch);cout<<"右尖括号:"<<">";
}
};break;
/* case '"':
{
cch=GetC();
switch(cch)
{
case'=':cout<<"16"<<">=";break;
case'>':cch=GetC();
if(cch=='=')cout<<"17"<<">>=";
else
{
Pushback(cch);
cout<<"18"<<">>";break;}
default:Pushback(cch);cout<<"右尖括号:"<<">";
}
};break;//*/
////////////////////////////////////////////////////////////////////////
case '=':
{
cch=GetC();
if(cch=='=') cout<<"20"<<"==";
else
{
Pushback(cch);
cout<<"21"<<"=";
}
};break;
case '%':
{
cch=GetC();
if(cch=='=') cout<<"22"<<"%=";
else
{
Pushback(cch);
cout<<"23"<<"%";
}
};break;
case '!':
{
cch=GetC();
if(cch=='=') cout<<"不等于:"<<"!=";
else
{
Pushback(cch);
cout<<"感叹号:"<<"!";
}
};break;
case '&':
{
cch=GetC();
switch(cch)
{
case '&':cout<<"26"<<"&&";break;
case '=':cout<<"27"<<"&=";break;
default:Pushback(cch);cout<<"28"<<"&";
}
};break;
//////////////////////////////////////////////////////////////////////////
case '#':cout<<"＃号:"<<"#"<<endl;
{
// for(k=0;k<100;k++)
// str[0]='\0';
cch=GetC();
if((cch>='a'&&cch<='z')||(cch>='A'&&cch<='Z'))//字符是字母
{
str[++k]=cch;//当前字符存入str数组中
cch=GetC();
while((cch>='a'&&cch<='z')||(cch>='A'&&cch<='Z'))
{
str[k++]=cch;
cch=GetC();
str[k]=' ';
Pushback(cch);//是\0的话回退
cout<<"#头文件名:"<<str;break;
}
}
};break;
case '^':
cch=GetC();
if(cch=='=')cout<<"29"<<"^=";
else
{
Pushback(cch);cout<<"30"<<"^";
};break;
case '|':
cch=GetC();
switch(cch)
{
case'|':cout<<"31"<<"||";break;
case'=':cout<<"32"<<"|=";break;
default:Pushback(cch);cout<<"33"<<"|";
};break;
case '(':cout<<"左小括号:"<<"(";break;
case ')':cout<<"右小括号:"<<")";break;
case '[':cout<<"左中括号:"<<"[";break;
case ']':cout<<"右中括号:"<<"]";break;
case '{':cout<<"左大括号:"<<"{";break;
case '}':cout<<"右大括号:"<<"}";break;
case '~':cout<<"40"<<"~";break;
case '.':cout<<" 点 :"<<".";break;
case '"':cout<<"双引号:"<<"\"";break;
case ';':cout<<"分号:"<<";";break;
case ',':cout<<"逗号:"<<",";break;
//case '#':cout<<"#";break;
case '?':
{
cch=GetC();
if(cch==':')cout<<"44"<<"?:";
else cerr<<"error!"<<endl;
}break;
}//switch
}//else
}//GetNextWord
/*string GetText()
{
string file_name1; //
cout<<"请输入源文件名（包括路径和后缀名）：";
cin>>file_name1;
ifstream infile(file_name1.c_str(),ios::in);
if (!infile)
{
cerr<<"哦！无法打开文件 "<<file_name1.c_str()<<" !!!"<<endl;
exit(-1);
}
cout<<endl;
char f[1000];
infile.getline(f,1000,EOF);
infile.close();
return f;
}//*/
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