Additional algorithm 26.html

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<!-- #  John Wiley & Sons, Inc.                                                                                                   # -->
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<!-- #  Book:   Algorithms in Bioinformatics: Theory and Implementation                                                           # -->
<!-- #  Author: Dr. Paul A. Gagniuc                                                                                               # -->
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<!-- #  Institution:                                                                                                              # -->
<!-- #    University Politehnica of Bucharest                                                                                     # -->
<!-- #    Faculty of Engineering in Foreign Languages                                                                             # -->
<!-- #    Department of Engineering in Foreign Languages                                                                          # -->
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<!-- #  Area:   European Union                                                                                                    # -->
<!-- #  Date:   04/01/2021                                                                                                        # -->
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<!-- #  Cite this work as:                                                                                                        # -->
<!-- #    Paul A. Gagniuc. Algorithms in Bioinformatics: Theory and Implementation. John Wiley & Sons, 2021, ISBN: 9781119697961. # -->
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<script>

// a step-by-step version for (C+G)%
document.write(CG_content('ATACCGGTCACGCGCGGCGCGCGCAC'));

function CG_content(s)
{
    s = s.toLowerCase();

    var a = 0;
    var t = 0;
    var c = 0;
    var g = 0;

    for (var u=0; u<=s.length; u ++)
    {
        var n = s.substr(u,1);
        if (n == "a") {a = a + 1;}
        if (n == "t") {t = t + 1;}
        if (n == "g") {g = g + 1;}
        if (n == "c") {c = c + 1;}
    }

    return (((c + g)/s.length) * 100).toFixed(2);
}

</script>