JavaCore java
Arithmetic Operator in Java
Basic Arithmetic Operators
- Java provides operators to perform mathematical operations.
int num1 = 7;
int num2 = 5;
int add = num1 + num2; // Addition → 12
int sub = num1 - num2; // Subtraction → 2
int mul = num1 * num2; // Multiplication → 35
int div = num1 / num2; // Division → 1 (integer division)
int mod = num1 % num2; // Modulus (remainder) → 2
System.out.println(add);
System.out.println(sub);
System.out.println(mul);
System.out.println(div);
System.out.println(mod);⚠️ Note: Division between two integers gives integer result.
Example: 7 / 5 = 1 (decimal part discarded).
Assignment with Operators (Shorthand)
int num1 = 7;
num1 += 2; // num1 = num1 + 2
num1 -= 2; // num1 = num1 - 2
num1 *= 2; // num1 = num1 * 2
num1 /= 2; // num1 = num1 / 2Increment and Decrement
- Post-Increment (
num1++) → use the value first, then increase. - Pre-Increment (
++num1) → increase first, then use the value. - Post-Decrement (
num1--) → use the value, then decrease. - Pre-Decrement (
--num1) → decrease first, then use the value.
Example:
int num = 5;
System.out.println(num++); // 5 (then num becomes 6)
System.out.println(++num); // 7 (increment first, then print)
System.out.println(num--); // 7 (then num becomes 6)
System.out.println(--num); // 5 (decrement first, then print)Key Points Recap:
%(modulus) gives remainder.- Integer division discards decimals.
++and--differ in order of operation (pre vs post).- Shorthand operators (
+=,-=,*=) make code cleaner.