Return sign of a 1 if a is positive and 1 if it's negative.

m Mathiason, Nick (2004). Big firms must sign bill of rights . The Observer (19 December).

Calculates n modulo d. The result is always non negative, the sign of d is ignored.

Calculates remainder of the integer division of n by d. The remainder has the sign of the n argument, if not zero.

To ensure alignment, any characters appearing before or after the number in the formatted output such as currency or sign symbols are padded as necessary with space characters to make their positive and negative formats an equal length.