Description |
 |
The addition, subtraction, and multiplication (+,
-, and *)
operators perform the usual arithmetic operations in C programs.
All of the arithmetic operators (except the unary plus and minus
operators) bind from left to right. The operands may be any integral
or floating-point value, with the following exception:
The modulo operator (%)
accepts only integer operands.
The unary plus operator (+exp)
and the addition and subtraction operators accept integer, floating-point,
or pointer operands.
The addition and subtraction operators also accept pointer
types as operands. Pointer arithmetic is described in “Pointer Operators (*,
->, &)”.
C"s modulo operator (%)
produces the remainder of integer division, which equals 0 if the
right operand divides the left operand exactly. This operator can
be useful for tasks such as determining whether or not a year is
a U.S. presidential election year. For example:
if (year % 4 == 0)
printf("This is an Olympic Games year.\n");
else
printf("There will be no Olympic Games this year.\n"); |
As required by the ANSI/ISO C standard, HP C supports
the following relationship between the remainder and division operators:
a equals a%b + (a/b) * b for any integer values of a and b |
The result of a division or modulo division is undefined if
the right operand is 0.
The sign reversal or unary minus operator (-)
multiplies its sole operand by -1.
For example, if x
is an integer with the value -8,
then -x evaluates
to 8.
The result of the identity or unary plus operator (+)
is simply the value of the operand.
Refer to “Operator Precedence ”
for information about how these and other operators evaluate with
respect to each other.
