import?java.io.BufferedReader;
import?java.io.IOException;
import?java.io.InputStreamReader;


public?class?Analysis?{
	private?String?statement;
	private?int?index=0;
	private?int?kuohu=0;
	
	public?static?void?main（String?arg[]）{
		System.out.println（“Please?enter?an?arithmetic?expression?to?analyse!“）;
		BufferedReader?in=new?BufferedReader（new?InputStreamReader（System.in））;
		String?expression;
		try?{
			expression?=?in.readLine（）+“#“;
			Analysis?test=new?Analysis（expression）;
			test.show（）;
		}?catch?（IOException?e）?{
			//?TODO?Auto-generated?catch?block
			System.out.println（“輸入出錯！“）;
		}
	}
	
	public?Analysis（String?expression）{
		statement=expression;
	}
	
	public?void?show（）{
		try?{
			E（）;
			System.out.println（“Successful!“）;
		}?catch?（Exception?e）?{
			//?TODO?Auto-generated?catch?block
			System.out.println（e.getMessage（））;
		}
	}
	private?void?E（）?throws?Exception{
		T（）;
		Ep（）;
	}
	private?void?Ep（）?throws?Exception{
		if（statement.charAt（index）==‘+‘||statement.charAt（index）==‘-‘）{
			index++;
			T（）;
			Ep（）;
		}else{
			if（statement.charAt（index）==‘）‘&&kuohu%2!=1）
				throw?new?Exception（“括號匹配錯誤“）;
			if（statement.charAt（index）!=‘#‘&&statement.charAt（index）!=‘）‘）
				throw?new?Exception（“存在非法符號！“）;
		}
	}
	private?void?T（）?throws?Exception{
		F（）;
		Tp（）;
	}
	private?void?Tp（）?throws?Exception{
		if（statement.charAt（index）==‘*‘||statement.charAt（index）==‘/‘）{
			index++;
			F（）;
			Tp（）;
		}else{
			if（statement.charAt（index）==‘）‘&&kuohu%2!=1）
				throw?new?Exception（“括號匹配錯誤“）;
			if（statement.charAt（index）!=‘#‘&&statement.charAt（index）!=‘）‘&&statement.charAt（index）!=‘+‘&&statement.charAt（index）!=‘-‘）
				throw?new?Exception（“存在非法符號！“）;
		}
	}
	private?void?F（）?throws?Exception{
		int?flag=0;
		if（statement.charAt（index）==‘（‘）{
			kuohu++;
			index++;
			E（）;
			if（statement.charAt（index）!=‘）‘）{
				throw?new?Exception（“括號匹配錯誤！“）;
			}
			kuohu--;
			index++;
			return;
		}
		if（statement.charAt（index）<=‘9‘&&statement.charAt（index）>=‘0‘）{
			index++;
			while（（statement.charAt（index）<=‘9‘&&statement.charAt（index）>=‘0‘）||statement.charAt（index）==‘.‘）{
				if（statement.charAt（index）==‘.‘）{
					if（flag==1）{
						throw?new?Exception（“浮點數錯誤！“）;
					}
					flag++;
				}
				index++;
			}
			return;
		}
		throw?new?Exception（“運算符錯誤！“）;
		
		
	}

}