www.pudn.com > fengzzzz.rar > fengzzzz.c

#include "stdio.h" 
#include "ctype.h" 
#include "string.h" 
#include "math.h" 
#include "stdlib.h" 
char keywords[32][12]={ 
		{'a','u','t','o','\0'}, 
		{'b','r','e','a','k','\0'}, 
		{'c','a','s','e','\0'}, 
		{'c','h','a','r','\0'}, 
		{'c','o','n','s','t','\0'}, 
		{'c','o','n','t','i','n','u','e','\0'}, 
		{'d','e','f','a','u','l','t','\0'}, 
		{'d','o','\0'}, 
		{'d','o','u','b','l','e','\0'}, 
		{'e','l','s','e','\0'}, 
		{'e','n','u','m','\0'}, 
		{'e','x','t','e','r','n','\0'}, 
		{'f','l','o','a','t','\0'}, 
		{'f','o','r','\0'}, 
		{'g','o','t','o','\0'}, 
		{'i','f','\0'}, 
		{'i','n','t','\0'}, 
		{'l','o','n','g','\0'}, 
		{'r','e','g','i','s','t','e','r','\0'}, 
		{'r','e','t','u','r','n','\0'}, 
		{'s','h','o','r','t','\0'}, 
		{'s','i','g','n','e','d','\0'}, 
		{'s','m','i','z','e','o','f','\0'}, 
		{'s','t','a','t','i','c','\0'}, 
		{'s','t','r','u','c','t','\0'}, 
		{'s','w','i','t','c','h','\0'}, 
		{'t','y','p','e','d','e','f','\0'}, 
		{'u','n','i','o','n','\0'}, 
		{'u','n','s','i','g','n','e','d','\0'}, 
		{'v','o','i','d','\0'}, 
		{'v','o','l','a','t','i','l','e','\0'}, 
		{'w','h','i','l','e','\0'} 
}; 
 
 
void main() 
{char filename[30]; 
char ch; 
int ch1=1; 
FILE * fp; 
char str[12]; 
int length; 
float number; 
do{ch1=1; 
printf("请输入你的文件全称名（包括路径）:"); 
scanf("%s",filename); 
if((fp=fopen(filename,"r"))==NULL) 
     {printf("该文件不存在！\n"); 
       ch1=0;} 
}while(!ch1);//确定输入正确的文件名// 
ch=fgetc(fp); 
 while(ch!=EOF) 
	   {ch1=(int)ch; 
	      if(isspace(ch1)) 
		  { ch=fgetc(fp); 
		   ch1=(int)ch; 
           continue; 
		  } //空格，回车换行的判断// 
	      if(isalpha(ch1)) 
		  {length=0; 
		     while(isalpha(ch1)||isdigit(ch1)||(ch=='_')) 
			 {str[length]=ch; 
		      length++; 
		      ch=fgetc(fp); 
		      ch1=(int)ch; 
			 } 
		   str[length]='\0'; 
		     if(compare(str)) 
			 { printf("%s\t关键字\n",str); 
			 } 
		     else 
			 { 
		       printf("%s\t标识符\n",str); 
			 } 
           continue; 
	       } 
		  //标识符的判断// 
	      if(isdigit(ch1)) 
		  {length=0; 
		      while(isdigit(ch1)||(ch=='.')) 
			  {str[length]=ch; 
		       length++; 
		       ch=fgetc(fp); 
		       ch1=(int)ch; 
			  } 
		   str[length]='\0'; 
		   printf("%s\t数字常量\n",str); 
           continue; 
		  } 
		  //数字常量的判断// 
	      if((ch=='*')||(ch=='/')) 
		  { 
	       printf("%c\t数字运算符\n",ch); 
		   ch=fgetc(fp); 
		   ch1=(int)ch; 
           continue; 
		  } 
		  //乘除的判断 
         if((ch=='+')||(ch=='-')) 
		 { printf("%c",ch); 
		   ch=fgetc(fp); 
		   ch1=(int)ch1; 
		      if((ch=='+')||(ch=='=')) 
			  { printf("%c\t自增运算符\n",ch); 
			    ch=fgetc(fp); 
			    ch1=(int)ch; 
			  } 
              else{ 
				  if((ch=='-')||(ch=='=')) 
				  {  printf("%c\t自减运算符\n",ch); 
			    ch=fgetc(fp); 
			    ch1=(int)ch; 
				  } 
                  else 
				  {printf("\t加减运算符\n",ch);} 
			  } 
			  } 
          //加减运算符的判断// 
	     	    if(ch=='=') 
		   {printf("%c",ch); 
		    ch=fgetc(fp); 
		    ch1=(int)ch; 
		      if(ch=='=') 
		      {printf("%c\t逻辑运算符\n",ch); 
		       ch=fgetc(fp); 
		       ch1=(int)ch; 
		      } 
		   else 
		     { 
		     printf("\t数字运算符\n"); 
		     } 
		   continue; 
		   }/* "=="的判断 */ 
       if((ch=='>')||(ch=='<')) 
		 { printf("%c",ch); 
		   ch=fgetc(fp); 
		   ch1=(int)ch; 
		     if((ch=='=')) 
			 { printf("%c\t逻辑运算符\n",ch); 
		       ch=fgetc(fp); 
		       ch1=(int)ch; 
		      } 
		   else 
		      { 
		       printf("\t逻辑运算符\n"); 
		       } 
		   continue; 
		  }  
		 /* "<,>,<=,>="的判断 */ 
     else 
	 { printf("%c\t界符\n",ch); 
	   ch=fgetc(fp); 
	   ch1=(int)ch; 
	 } 
 
		} 
       
//文件的执行 
 
fclose(fp); 
 
getch(); 
 
} 
 
 
int compare( char str[10])//关键字的判断，是则返回1// 
   {int i; 
    int flag=0; 
    for(i=0;i<32;i++) 
     {if(strcmp(str,keywords[i])==0) 
      {flag=1; 
       break;} 
      } 
   return flag; 
   }