z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

min(scale(A) * abs(B), max(scale, scale(A)))
where min calculates the minimum of a set of numbers and max calculates
the maximum.
A * B Calculates A multiplied by B. The scale of the result is:
min(scale(A) + scale(B), max(scale, scale(A), scale(B)))
A / B Calculates A divided by B. The scale of the result is the value of scale.
A % B Calculates the remainder from the division of A by B. This is calculated in
two steps. First, bc calculates A/B to the current scale. It then obtains the
remainder through the formula:
A - (A / B) * B
calculated to the scale:
max(scale + scale(B), scale(A))
A + B Adds A plus B. The scale of the result is the maximum of the two scales of
the operands.
A−B Calculates A minus B. The scale of the result is the maximum of the two
scales of the operands.
The next group of operators are all assignment operators. They assign values to
objects. An assignment operation has a value: the value that is being assigned.
Therefore, you can write such operations as a=1+(b=2). In this operation, the value
of the assignment in parentheses is 2 because that is the value assigned to b.
Therefore, the value 3 is assigned to a. The possible assignment operators are:
V = B Assigns the value of B to V.
V ^= B Is equivalent to V=V^B.
V *= B Is equivalent to V=V*B.
V /= B Is equivalent to V=V/B.
V %= B Is equivalent to V=V%B.
V += B Is equivalent to V=V+B.
V −= B Is equivalent to V=V-B.
The following expressions are called relations, and their values can be either true
(1) or false (0). This version of bc lets you use the relational operators in any
expression, not just in the conditional parts of if, while, or for statements. These
operators work exactly like their equivalents in the C language. The result of a
relation is 0 if the relation is false and 1 if the relation is true.
A == B Is true if and only if A equals B.
A = B Is true if and only if A is greater than or equal to B.
A != B Is true if and only if A is not equal to B.
A < B Is true if and only if A is less than B.
A > B Is true if and only if A is greater than B.
A && B Is true if and only if A is true (nonzero) and B is true. If A is not true,
the expression B is never evaluated.
bc
Chapter 2. Shell command descriptions 55