Hi. My problem is that I am trying to write a script that compares two strings of DNA of exactly the same length at each position. e.g string1 ACTA string2 AGTC so i want to compare both first letters, both second letters etc.... If the letters at a particular position are different i want to print a '*' for mismatch. I have tried to do this but the following bit of code doesn't work. Any suggestions much appreciated. 

# e.g @lines1 contains CACTATGAGTGATCGC and @lines2 contains
# ACTGACTAATGCGTTG.

foreach $base (@lines1, @lines2)  {

 shift @lines1;
 shift @lines2;

  if (@lines1[0] eq @lines2[0])  {
  
      last;
  }

  else {

 print "*\n";

 }
}

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In reply to comparing strings by Anonymous Monk

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