RemInt( n1, n2 )
RemInt returns the remainder of its two integer operands.
If n2 is not equal to zero
RemInt( n1, n2 ) = n1 - n2*
QuoInt( n1, n2 ). Note that the rules given for
QuoInt) imply that
RemInt( n1, n2 ) has the same sign as n1 and
its absolute value is strictly less than the absolute value of n2.
Dividing by 0 signals an error.
gap> RemInt(5,2); RemInt(-5,2); RemInt(5,-2); RemInt(-5,-2); 1 -1 1 -1
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