Basic (2) P25788

You have to program several functions. In each case, few lines of code are enough.

1. Write a function @vowel_consonant(s)@ that given an string $s$ returns the number of vowels and consonants that appear as characters in $s$. We assume all characters of $s$ are letters.

2. Write a function @delete_digits(s)@ that returns the string obtained after ruling out the digit characters of $s$.

3. Write a function @switch(s)@ that given an string $s$ returns the string obtained after switching lowercase to uppercase letters and the other way around. Non letter characters do not change. Warning: do not use the @swapcase@ string method.

4. Write a function @countdown(n)@ that given an integer $n$ greater than zero prints the count down until $0$.

5. Write a function @powers_of_2(n)@ that given a natural $n$ prints the $n$ first powers of 2.

Scoring

Every function counts 20 points.

Sample session