Question

I am having difficulty of creating a method to display first n digits of a number when ‘n’ is determined by the user.

For example, user inputs an integer ‘1234567’ and a number of digits to display ‘3’. The method then outputs ‘123’.

I have an idea how to display the first digit:

long number = 52345678;
long prefix = number /= (int) (Math.pow(10.0, Math.floor(Math.log10(number))));

But I seem not being able to figure out how to display a user defined first n digits.

Thank you!

Answer 1

int a = 12345;
int n = 3;
System.out.println((""+a).substring(0, n));

If you want a number:

int b = Integer.parseInt((""+a).substring(0, n));