Career cup 5.2

DecimalRepr.java

package Chapter5;

public class DecimalRepr {
    private static double ROUND_ERR = 0.0000000001;
    
    public static void printBinary(double realNum) {
	if(realNum >= 1 || realNum <= 0) return;
	StringBuilder repr = new StringBuilder();
	repr.append("0.");
	double m = 0.5;
	int bit = 0;
	
	//What is the definition of "accurately"?
	//careful double round error	
	while(realNum - 0 >= ROUND_ERR) {
	    if(bit >= 32) {
		//System.out.println("ERROR");
		System.out.println("ERROR");
		return;
	    }
	    
	    if(realNum >= m) {
		repr.append('1');
		realNum -= m;
	    } else 
		repr.append('0');
	    m *= 0.5;
	    bit++;
	}
	System.out.println(repr.toString());
    }
    
    public static void main(String[] args) {
	printBinary(0.75);
	printBinary(0.72);
	printBinary(0.61);
    }
}