[QUOTE]Originariamente inviato da m3kka
...
[quote]codice:private void button1_Click(object sender, EventArgs e) { int dim = textBox1.Text.Length; int i = textBox1.Text.Length, a = (textBox1.Text.Length * 3); char[] seq = new char[i]; string nseq = ""; seq = textBox1.Text.ToCharArray(); for(i=textBox1.Text.Length - 1; i>=0; i--) { if (seq[i] == 'k') { if (seq[i - 1] == 'a') { nseq = nseq.Insert(a, "AAG"); a = a - 3; } } } textBox1.Text = nseq; }