question2.java

java课程的资料以及实验的代码

class printOut
{
	public static void main(String args[])
	{
		int length=args.length;
		if (length<1) //if no input argument, exit
		{
			System.out.println("invalid number of arguments\n");
			System.exit(1);
		};
		float salary; // total salary 
		int tax_dollar, tax_cent; // tax in $ && tax in cents
		salary=Float.parseFloat(args[0]); // obtain total salary
		float tax=salary*0.35f; //compute total tax
		//System.out.println(tax);
		if (salary<0)
		{
			System.out.println("invalid salary\n");
			System.exit(1);
		}
		else 
		if (salary==0)
		{
			tax_dollar=0;
			tax_cent=0;
		}
		else
		{
			tax_dollar=(int)tax; // tax in $ (integer)
			float tax_cent_tmp; // internal temporary variable when rounding
			tax_cent_tmp=(tax-tax_dollar)*100;
			byte temp=(byte)((tax_cent_tmp-(int)tax_cent_tmp)*10); //temp is the third number of tx in cents
			tax_cent=(int)tax_cent_tmp+(int)((temp>=5)?1:0); // rounding tax in cents
			System.out.println("Tax is "+tax_dollar+"$ and "+tax_cent+" cents");
		}
	}
}