Groups > comp.lang.java.programmer > #7474

number conversion

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From	mamta81 <roy.mamta@gmail.com>
Newsgroups	comp.lang.java.programmer
Subject	number conversion
Date	Mon, 29 Aug 2011 11:01:44 -0700 (PDT)
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Hi all,

I have written  a number check function. The purpose is to know number
of digits before and after decimal.


public void checkNumber(double number){

		System.out.println("number ------------------->" + number );
		Double d = new Double(number);
		String n = d.toString();
		System.out.println("n" + n);

		for(int i =0; i< n.length();i++){
			if(n.charAt(i)=='.'){
				System.out.println("Is a decimal number");
			}
		}

		 int index = n.indexOf(".");
		 System.out.println("index" + index);
		 String dec = n.substring(index + 1);
		 System.out.println("dec " + dec);

		 if(dec.length() > 6 ){
			 System.out.println("only 6 digits allowed after decimal");
		 }

		 String num = n.substring(0,n.indexOf("."));
		 System.out.println("num " + num);
		 if(num.length()>10){
			 System.out.println("Only 10 places allowed before decimal");
		 }
		}
	}


when i give checkNumber( 33333335.2534566d); as input i get the
following o/p

number ------------------->3.33333352534566E7
n3.33333352534566E7
Is a decimal number
index1
dec 33333352534566E7
only 6 digits allowed after decimal
num 3


1) what happens to my input for which I get a wrong index of ". "?
2) Is there any other way to find the number of digits before and
after decimal?

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Thread

number conversion mamta81 <roy.mamta@gmail.com> - 2011-08-29 11:01 -0700
  Re: number conversion Screamin Lord Byron <scre@min.dot> - 2011-08-29 21:35 +0200
  Re: number conversion Roedy Green <see_website@mindprod.com.invalid> - 2011-08-29 14:08 -0700
    Re: number conversion Lew <lewbloch@gmail.com> - 2011-08-29 14:17 -0700
      Re: number conversion Roedy Green <see_website@mindprod.com.invalid> - 2011-08-29 14:52 -0700
  Re: number conversion Roedy Green <see_website@mindprod.com.invalid> - 2011-08-29 14:17 -0700

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