arithmetic_operations.md

#Arithmetic Operations

"The binary arithmetic operators are +, -, *, /, and the modulus operator %. Integer division truncates any fractional part. The expression

x % y

produces the remainder when x is divided by y, and thus is zero when y divides x exactly. For example, a year is a leap year if it is divisible by 4 but not by 100, except that years divisible by 400 are leap years. Therefore

  if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
    printf("%d is a leap year\n", year);
  else
    printf("%d is not a leap year\n", year);

The `%` operator cannot be applied to `float` or `double`. The direction of
truncation for `/` and the sign of the result for `%` are machine-dependent
for negative operands, as is the action taken on overflow or underflow.

The binary `+` and `-` operators have the same precedence, which is lower than
the precedence of `*`, `/`, and `%`, which is in turn lower than unary `+` and
`-`. Arithmetic operators associate left to right.

From "The C Programming Language" p. 41