A problem determining the length of an int variable converted to a string..........

[Steve Jensen]

I'm writing a program whereby I'm accepting input form the keyboard, converting it to a String, and then displaying it.
Firstly however, I want to check whether the inputted value comprises more than 1 charcater or not.
I've done the following :-

class Test
{
public static void main ( String args[] )
    {
        int num;
        num = Integer.parseInt ( args[0] );
        if ( args.length >= 2 )
        {
        System.out.println("two digits or more present - " + num);
        }
    }

}

In other words, if I enter the value '22' at the keyboard, because it comprises of more than one digit, i want the program to print "two digits present!".
But it doesn't work - nothing happens.
What am I doing wrong here?
[ December 23, 2002: Message edited by: Marilyn de Queiroz ]

[Jim Yingst]

args is an array with all command line arguments (however many there are). args[0] is the String representing the first argument (if there is one). So you want to look at args[0].length() rather than args.length. Of course, make sure args.length > 0 before trying to access args[0].

[Thana Bujakorn]

There are differences b/w: length and length(), i modified your prog, hope it will help you understand better.

class Test
{
public static void main ( String args[] )
{
String[] outputs = new String[args.length];
for (int i=0; i<args.length; i++){
outputs[i] = new String(args[i]);
if (outputs[i].length() >=2)
System.out.println("two digits or more present at String :"+ outputs[i] );
}
}
}

[ December 23, 2002: Message edited by: Marilyn de Queiroz ]

[Michael Matola]

Here's one of several possible ways of getting a count of the digits in an integer.

public class SteveTest2
{
public static void main ( String args[] )
{
    if ( args.length > 0 )
    {
        int num = Integer.parseInt ( args[0] ) ;
        int digits = 1 ;
        if ( num < 0 )
        {
            num = -num ;
        }
        while ( ( num /= 10 ) > 0 )
        {
            digits++ ;
        }
        System.out.println( "number of digits --> " + digits ) ;
    }
}
}

[ December 22, 2002: Message edited by: Michael Matola ]

[Jim Yingst]

Moving to Cattle Drive...