Basic arithmetic
Description
Use +, -, *, and / for common calculations.
Explanation
Parentheses make calculation order explicit.
Example
int total = 4 + 6 * 2;← Chapter 2 — Core Syntax & Data
10. Arithmetic Operators
mixed
Description
Arithmetic operators let programs calculate totals, differences, products, quotients, and remainders. They work naturally with numeric variables.
When both operands are integers, division returns an integer result. Convert one operand to double when a fractional answer matters.
Subtopics
Remainder operator
Description
The % operator returns the remainder.
Explanation
It is useful for even/odd checks and repeating patterns.
Example
boolean even = 12 % 2 == 0;Explanation
Operator precedence can surprise beginners. Write parentheses whenever they make a formula easier for another person to verify.
Example
public class ArithmeticDemo {
public static void main(String[] args) {
int scored = 82;
int total = 100;
double percent = scored * 100.0 / total;
System.out.println(percent);
}
}Key points
- Integer division discards fractions.
- % returns a remainder.
- Parentheses improve readability.