title: ': not a valid identifier
body: <p>I have removed the two if statements from before and replaced them with a case statement and tried to remove all the error from the code.
  I am trying to run this code but i get an error in the case statement.
  "': not a valid identifier<br>
  main.sh: line 5: syntax error near unexpected token <code>$'in\r''<br>
  'ain.sh: line 5:</code>case "$y" in   "</p>
  
  <pre><code>    #!/bin/bash
  echo "1. Julian"
  echo "2. Gregorian"
  read y
  case "$y" in
  1)echo "Enter your year (1900-2050)"
  read x
  if [[ $x -ge 1900 &amp;&amp; $x -le 2050 ]]
   then
  a=$((x%19)) 
  b=$((x/100))
  c=$((x%100))
  d=$((b/4))
  e=$((b%4))
  g=$(((8*b+13)/25))
  h=$(((19*a+b-d-g+15)%30))
  m=$(((a+11*h)/319))
  j=$((c/4))
  k=$((c%4))
  l=$(((2*e+2*j-k-h+m+32)%7))
  n=$(((h-m+l+90)/25))
  p=$(((h-m+l+n+19)%32)) 
  o=$(date +"$x-$n-$p")
  
  echo "Gregorian Easter is on $O."
  
  else
   echo "Invalid Input" 
   fi
  ;;
  
  2) echo "Enter your year (1900-2050)"
  read x
  if [[ $x -ge 1900 &amp;&amp; $x -le 2050 ]]
   then
  A=$((x%4)) 
  B=$((x%7))
  C=$((x%19))
  D=$(((19*C+15)%30))
  E=$(((2*A+4*B−D+34)%7))
  M=$(((D+E+114)/31))
  day=$(((D+E+115)%31))
  o=$(date +"$x-$M-$day")
  
  echo "Gregorian Easter is on $o."
  else 
   echo "Invalid Input"
  fi
  ;;
  0) exit ;;
  esac
  </code></pre>