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

}