counting_mutations.nim

# counting point mutations
# count all mutations where C != C, G !=G, A != A, and T != T
import algorithm

# define string variables
var s: string = "GAGCCTACTAACGGGAT"
var t: string = "CATCGTAATGACGGCCT"

# define count variable for number of mutations
var mutations: int = 0

# for loop if letter of string s does not match letter of string t increase mutation variable by 1
if s.len != t.len:
  echo "Different lengths!"

for i in 0 .. min(s.high, t.high):
  if s[i] != t[i]: # I'm not sure how to iterate over the individual letters of string t here, I tried t.mitems but that didn't work.
    mutations.inc()

echo mutations