1. CS111 Lab
Arithmetic
Instructor: Michael Gordon

2. C++ Arithmetic Operators
 + Addition
 - Subtraction
 * Multiplication
 / Division
 % Modulus (remainder)
 () Parentheses

3. Order of Operations
 ()
 * / %
 + -
 (4 + 2) / 2 + 4 = ???
 Operation in () first: 4+2=6
 Division next: 6 / 2 = 3
 Last addition, 3 + 4 = 7

4. Integer and Decimal Division
 Division of two integers drops the decimal:
 5 / 2 = 2 (not 2.5)
 4 / 2 = 2
 Division involving a double type, will result
in a double result (with decimal)
 5 / 2.0 = 2.5
 4 / 2.0 = 2
 One or both numbers must be a double
 Same rules apply to addition, subtraction
and multiplication.

5. Data Types and Order
 Sample operations and resulting data
types:
 6.0 + 5 / 2
 Result of first operation: int
 Result of second operation: double
 • 5 + 5 / 2.0
 Result of first operation: double
 Result of second operation: double

6. Type casting
 Type casting changes one type to
another.
 For example if you want a double type
result of integer division, you can do this:
 double result = (double) 5 / 2
 result now equals 2.5

7. Type casting
 Reverse example (double to int)
 Drops the decimal part
 double total = 100.5;
 int value = (int) total;
 value now equals 100.