judge.java

此程序使用在java环境下开发的

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package bianyi;

/**
 *
 * @author lina
 */
public class Judge {
 static boolean letter(char c)
        {if((c>='a'&&c<='z')||(c>='A'&&c<='Z')||c=='.')return true;
         else return false;
        }
 static  boolean figure(char c)
      {
       if(c>='0'&&c<='9')return true;
         else return false;
       }
 static boolean  denotation(char c)
      { if(c=='+'||c=='-'||c=='*'||c=='/'||c=='{'||c=='}'||c=='%'||c=='='||c=='<'||c=='>'||c=='('||c==')'||c=='['||c==']'||c==':'||c==';'||c==','||c=='"'||c=='.'||c=='!'||c=='#')
           return true;
        return false;
       }
}