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How can I correct the code in line 10 for while loop while (my $fm= substr ($DNA1,0,4)) {

If I'm understanding you correctly, you want to update the offset in that substr:

my $offs = 0; while (my $fm= substr($DNA1, $offs, 4)) { $offs += 4; ... }

or

for (my $offs=0; my $fm=substr($DNA1, $offs, 4); $offs+=4 ) { ... }

That would give you the 3 substrings "GGCT", "CTGC" and "GCGG".


In reply to Re: Why am I getting the result only from 1st substring and not from substring 2 and 3 in using the do-until loop with while loop inside it? by Eliya
in thread How can I get the correct results for substrings 2 and 3 in a do-until loop? by supriyoch_2008

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