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/* Gconvert:
 *    This preprocessor macro is defined to convert a floating point
...
 *        d_Gconvert='sprintf((b),"%.*g",(n),(x))'
 *    The last two assume trailing zeros should not be kept.
 */

$ perl -le 'printf "%.54g\n", 0.3;'
0.29999999999999999

0.299999999999999988897769753748434595763683319091796875