Constructs a number from a boolean sign, an integer coefficient and
an optional integer exponent.
The sign of the number is the value of the sign parameter
regardless of the sign of the coefficient.
The intial precision of the number is deduced from the number
of decimal digits in the coefficient.
Constructs a number from a boolean sign, an integer coefficient and an optional integer exponent. The sign of the number is the value of the sign parameter regardless of the sign of the coefficient. The intial precision of the number is deduced from the number of decimal digits in the coefficient.