Question

I am web developer. I need to create a function to get the posible random number for given length of string. Please give the formula for that.

ex:-

1 digit = 10 (0,1,2,3,......9)
2 digit = (00,01,02,...11,12,13,...)

please help me ! Thanks

Answer 1

The smallest possible value that uses $n$ decimal digits is zero (assuming you don’t allow negative numbers, which I assume you don’t) and the largest is $99\dots 9$, where there are $n$ $9$s. A shorter way of writing that number is $10^n – 1$, so your function should return a list of every number from $0$ to $10^n – 1$.

In many programming languages this is trivial to write:

In Python 2.7:

def sample(n):
    return range(10**n)

In R:

sample <- function(n) {
    return(seq(0, 10^n-1))
}