| #### D.12.2.1 round Procedure from library `crypto.lib` (see crypto_lib). Usage: round(r); Return: the nearest number to r out of Z Assume: r should be a rational or a real number Example:
    LIB "crypto.lib";
    ring R = (real,50),x,dp;
    number r=7357683445788723456321.6788643224;
    round(r);
    ==> 7357683445788723456322

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