| #### 7.10.6.5 ncratAdd Procedure from library `ncrat.lib` (see ncrat_lib). Usage: ncrat h = ncratAdd(f, g); f, g both of type ncrat Return: h = f + g Note: operator '+' for ncrat is overloaded with this procedure, hence ncrat h = f + g; yields the same result as ncrat h = ncratAdd(f, g); Example:
    LIB "ncrat.lib";
    ncInit(list("x", "y", "z"));
    ncrat f = ncratFromString("2*x*y");
    print(f);
    ==> 2*x*y
    ncrat g = ncratFromString("z");
    print(g);
    ==> z
    ncrat h1, h2;
    h1 = ncratAdd(f, g);
    print(h1);
    ==> 2*x*y+z
    h2 = f + g;
    print(h2);
    ==> 2*x*y+z

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