File: convfmt.awk

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gawk 1%3A4.0.1%2Bdfsg-2.1
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BEGIN {
	CONVFMT = "%2.2f"
	a = 123.456
	b = a ""                # give `a' string value also
	printf "a = %s\n", a
	CONVFMT = "%.6g"
	printf "a = %s\n", a
	a += 0                  # make `a' numeric only again
	printf "a = %s\n", a    # use `a' as string
}