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Home/ Questions/Q 226165
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Editorial Team
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Editorial Team
Asked: May 11, 20262026-05-11T19:29:05+00:00 2026-05-11T19:29:05+00:00

I once saw this line of code: std::cout %lt;%lt; Hello world! %lt;%lt; std:: endl;

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I once saw this line of code:

std::cout %lt;%lt; "Hello world!" %lt;%lt; std:: endl;

And am wondering what %lt;%lt; means.

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  1. Editorial Team
    Editorial Team
    2026-05-11T19:29:05+00:00Added an answer on May 11, 2026 at 7:29 pm

    You must have seen that online. Someone uploaded this line:

    std::cout << "Hello world!" << std::endl;
    

    Which was translated to this for output to html:

    std::cout &lt;&lt; "Hello world!" &lt;&lt; std::endl;
    

    Because, of course, &lt; is the html entity for <.

    Finally, something somewhere decided to change the ampersands to percent signs, possibly as part of a url-encoding scheme.

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