• Credits

• Operators / and %

• / and % examples

• Expression Type

• Mixed-Type Assignment

• Rules for Expression Evaluation

• Casting

• Authored by John Even

• Faculty supervisor Al Day

• Written for HTML by Matt Robinson

• Last updated 6/22/95

• Division Operator:
  • When used on integers, fractional parts are dropped.

    e.g. 7/2=3

  • When using floating values, normal division is carried out.

• Remainder Operator:
  • The % operator returns the integer remainder of the result of dividing its first operand by its second. Both operands must be integers.

    e.g. 7%2=1

The data ype of each variable must be declared, but how do you determine the data type of an expression?

It depends on its operands. If all operands are of type int, then the expression is of type int. Otherwise it is of type double.

e.g.

When an assignment statement is performed, the expression is first evaluated, then the result is assigned.

A common error is to assume that the type of the variable will force the expression to be evaluated as if it were of that type. This is not the case.

e.g.

int x=5, y=2;

double z=x/y;

z is now equal to 2.0 because the expression was evaluated using integer division not regular division.

When you assign a number of type double to an int variable, the fractional part of the number is dropped.

e.g.

int x=13*0.5;

int y=1*.99;

In this example x is evaluated as 6, and y is evaluated as 0.

• Parentheses come first, starting with the inside parentheses, and working outwards.

• Operator precedence:
  • first, unary +,-

  • next, *,/,%

  • last, binary +,-

• Associativity rule:
  • unary right to left

  • binary left to right

Placing the name of a different type in parentheses before a value will change, or cast, the value to the new type.

e.g.

(int)5.733

has a value of 5

Casting has a very high-precedence, being performed before multiplication and division.