numericconverter.java

a program that takes in an integer number as an argument and returns its equivalent in the binary a

/**
* A class to conver the integer number to the binary 
* and octal.
* @author Ruixiao Wu
* @version 1.0  24/05/2006
*/
public class NumericConverter {	
	public int number;

	public NumericConverter(int number){//constructor
		this.number = number;
	}//End constructor
	
	/**
	* A method to conver integer to binary.
	* The detail method is devide the number by 2, get and store the residue in an array.
	* Reverse the array and print. 
	* Thus we can get the result.  
	* @param number
	*/	
	public void convertIntegerToBinary(int number){//I didn't use the ArrayList, so this method is very complicated.
	    int counter = 0;//This parameter is used to count the capacity of a array
	    int testLength = number;
	    int testNumber = number;
	    while(testLength != 1){
	    	testLength = testLength /2;
	    	counter++;//Firstly, test the need of capacity of the store array.
	    }	    
		int[] container = new int[counter+1];
		int[] container1 = new int[counter+1];		
		int i = 0;
		while(testNumber != 1){
			container[i] = testNumber%2;//Secondly, store the residue in an array .			
			testNumber = testNumber / 2;			
			++i;
		}		
		container[container.length-1]=testNumber;//Thirdly, get the last bit of the residu and finish!		
		for(int j=0;j<container.length;++j){
			int length = container.length;
			container1[j]= container[length-1-j];
			System.out.print(container1[j]);//Print the array!	
			}	
	}//End method.
	
	/**
	* A method to conver integer to binary.
	* The detail method is devide the number by 8, get and store the residue in an array.
	* Reverse the array and print. 
	* Thus we can get the result.  
	* @param number
	*/	
	public void convertIntegerToOctal(int number){//I didn't use the ArrayList, so this method is very complicated.
		int counter = 0;//This parameter is used to count the capacity of a array
	    int testLength = number;
		int testNumber = number;
		while(testLength > 7 ){
		    testLength = testLength /8;
		    counter++;//Firstly, test the need of capacity of the store array.
		}	    
	    int[] container = new int[counter+1];
		int[] container1 = new int[counter+1];		
		int i = 0;
		while(testNumber > 7){
			container[i] = testNumber%8;//Secondly, store the residue in an array.			
			testNumber = testNumber / 8;			
			++i;
		}		
		container[container.length-1]=testNumber;//Thirdly, get the last bit of the residu and finish!		
		for(int j=0;j<container.length;++j){
			int length = container.length;
			container1[j]= container[length-1-j];
			System.out.print(container1[j]);//Print the array!	
		}	
		
	}//End method.
	
	/**
	* The main method to run the program. 
	* The method contain the try and catch method.
	*/	
	public static void main(String[] args){		
		int  number;		
		try { number = Integer.parseInt(args[0]); }//try whether the input is an integer.
		catch (Exception wrongInput) {//catch the exception and print the error.
		System.out.println("Error: Cannot convert value into binary and octal formats."+
		                   "\nThe input parameter is not an integer number.");
		return;//return in order to break the program.
		}
		
		NumericConverter NC = new NumericConverter(number);
		System.out.print("The integer number "+ number +" is:");
		NC.convertIntegerToBinary(number);
		System.out.print(" in binary / ");
		NC.convertIntegerToOctal(number);
        System.out.print(" in octal.");		  
	}//End main.
}//End class.