Description |
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The addition, subtraction, and multiplication (+, -, and *) operators perform the usual arithmetic operations
in C programs. 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.
