Question

I have to find the most left digit in a randomly generated number (for example: 46891 -> 4). No matter what the number is I keep getting zero. Here’s one of the codes I try:

int num1 = (int)((Math.random()*100000)+1);

while((Math.floor(num1/10))>0)
    {
        num1 = (int)Math.floor(num1/10);
    }

    System.out.println("Left digit: " + num1);

I tried to use Integer.parseInt, but I got this mistake, obviously: The method parseInt(String) in the type Integer is not applicable for the arguments (int).

What am I doing wrong and how can I make it work?

Thank you!

Answer 1

how about this :

final Random r=new Random();
final int t=r.nextInt(100000)+1;
// naive way:
final String s=Integer.toString(t);
System.out.println("left digit is:"+s.charAt(0));
// "math" way:
int temp=t;
while(temp>=10)
  temp/=10;
System.out.println("left digit is:"+temp);