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14 [C] 산술연산자

Arithmetic Operators

 

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.

 

 

[The C Programming Language p.41]

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