4 Java Arithmetic

Arithmetic Operators in Java

1. • Addition
2. • Subtraction
3. • multiplication
4. / division
5. % modulus

Modulus

• To divide and take the remainder
• 5 mod 3 = 2
• 4 mod 2 = 0
• Their example:
• 17 / 5 = 3 remainder 2
• 17 mod 5 = 2
• 15 % 6 = 3
• 10 % 2 = 0

Order of Operations

• it applies
• Parentheses matter
• Multiplication and division and modulus are prioritized before addition and subtraction

Variables can be written as complex expressions int mysteryNum = 412/3(4/3+2); would work fine.

integers and doubles

• integer division is not equivalent to double division
• 5 / 2 != 2.5
• 5 / 2 == 2
• 5 / 2.0 = 2.5
• 5.0 / 2 = 2.5
• result is an integer so the decimal point is truncated unless you cast to a double

Dividing by zero causes ArithmeticException