# Raku challenges Week 2

Task 2. Convert a number to the one represented as a base-35 number and back.

The solutions in the Raku programming language of the challenges offered on Week 2 of the Perl Weekly Challenges.

Remove leading zeros from positive numbers.

So, we need to take a string such as `000042` and print it as `42`. Even here, there are two obvious solutions:

```my \$n = '00000042';

say +\$n;
say \$n.Int;```

A prefix form of `+` converts the string to an integer. The same can be done by an explicit call of the `Int` method.

The program prints the expected number:

`\$ raku ch-1.raku4242`

Convert a number to the one represented as a base-35 number and back.

In Raku, there is a pair of routines, `base` and `parse-base`. They are ideal tools for solving the task.

To convert the number, use `base`:

```my \$n = 2020;
my \$n35 = \$n.base(35);

say \$n35;```

This prints `1MP`.

To convert it back to decimal system, use `parse-base`:

```my \$n10 = \$n35.parse-base(35);
say \$n10;```

After this operation, the program prints the initial number `2020`.

Look for the source files in the folder 002 of the GitHub repository.