To test the difference between NumToStr() and Prec() you can plot this in 
indicator pane:

// Precision Function Example

nmb = C * 1.8889;

Title =
"\\c11Num=" + nmb +
"\\c34  NumToStr(n, 1.1) = " + NumToStr(nmb, 1.1) +
"\\c32  Prec(n, 1) = "       + Prec    (nmb, 1  );

/*** END ***/


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