usecalculation.java

递归子程序法：对应每个非终结符语法单元编一个独立的处理过程（或子程序）。语法分析从读入第一个单词开始

	package calculation;
	/** 
	 * Java语言实验参考程序
	 * Company 北京师范大学计算机系
 
	 * @author 孙一林
	 * @version 1.0
	 */
	import calculation.*;						// 导入calculation包
	public class UseCalculation {						
	  public static void main(String args[]){

		CalculationClass oneCalculate = new CalculationClass();
		if( oneCalculate.Calculate(1500,5,'/') )
		  System.out.println(oneCalculate.getI_CalculateResult());
												// 输出正常的计算结果
		else
		  System.out.println("计算错误为" + oneCalculate.getE_Information());
												// 输出异常信息
		if( oneCalculate.Calculate(1500,0,'/') )
		  System.out.println(oneCalculate.getI_CalculateResult());
		else
		  System.out.println("计算错误为" + oneCalculate.getE_Information());
		if( oneCalculate.Calculate(12345,54321,'*') )
		  System.out.println(oneCalculate.getI_CalculateResult());
		else
		  System.out.println("计算错误为" + oneCalculate.getE_Information());
		if( oneCalculate.Calculate(987654321,123456789,'-') )
		  System.out.println(oneCalculate.getI_CalculateResult());
		else
		  System.out.println("计算错误为" + oneCalculate.getE_Information());
		if( oneCalculate.Calculate(123456789,987654321,'+') )
		  System.out.println(oneCalculate.getI_CalculateResult());
		else
		  System.out.println("计算错误为" + oneCalculate.getE_Information());
	  }
	}