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Message: [QUOTE="Dr J R Stockton, post: 4949539"] In comp.lang.javascript message <VuCdna1-2I7_NaLb4p2dnA@giganews.com>, If you've quoted it adequately, it does so state; the first character (disregarding sign) must be 0 or 1, then there must be a point, then at least one digit. Eh? The following will take any possible Number (AFAICS), including NaN and Infinities, and output it in a sensible form with a decimal point where possible. It assumes Number.toString is ECMA-compliant or better. Str = String(Num).replace(/^(-?\d+)$/, "$1.0") If the OP's code, at whatever stage of development, should happen to generate a Number of magnitude greater than 1.0, it's probably desirable that the transformation should not add confusion by doing further damage. StrS(Num, 1, 1), via the FAQ, would do it, with a simpler Sign function; but that's overkill unless needed otherwise. But the application may be such that 1/7 should be presented as, say, "0.143" rather than "0.14285714285714285". [/QUOTE]