Java Math floorMod() Method Last Updated : 13 May, 2025 Summarize Comments Improve Suggest changes Share Like Article Like Report The Math.floorMod() is a built-in math function in Java that returns the floor modulus of the integer arguments passed to it. Therefore, floor modulus is (a - (floorDiv(a, b) * b)), has the same sign as the divisor b, and is in the range of -abs(b) < result < +abs(b). The relationship between floorDiv() and floorMod() is:floorDiv(a, b) * b + floorMod(a, b) == aThe difference in results between floorMod and the % operator is due to the difference between floorDiv() which returns the integer less than or equal to the quotient, and the "/ " operator that returns the integer closest to zero.Syntax of floorMod() Methodpublic static int floorMod(int a, int b)public static long floorMod(long a, long b)Parameters: a: the dividend (number to be divided)b: the divisorReturn Value: It returns the remainder after division, where the result always carries the sign of the divisorException: If the divisor is 0, it throws an ArithmeticException.Examples of Java Math floorMod() MethodExample 1: In this example, we are going see how floorMod() method handles different sign cases. Java // Java program to demonstrate Math.floorMod() import java.lang.Math; public class Geeks { public static void main(String[] args) { int a = 25; int b = 5; System.out.println("Result 1: " + Math.floorMod(a, b)); int c = 123; int d = 50; System.out.println("Result 2: " + Math.floorMod(c, d)); int e = 123; int f = -50; System.out.println("Result 3: " + Math.floorMod(e, f)); int g = -123; int h = 50; System.out.println("Result 4: " + Math.floorMod(g, h)); } } OutputResult 1: 0 Result 2: 23 Result 3: -27 Result 4: 27 Explanation: In this example, In the first case, we start with 25 mod 5 and for this, the remainder is 0.In the second case, we use 123 mod 50. So, 123 / 50 = 2 with a remainder of 23.In the third case, we use 123 mod -50. This returns -27 because it follows the negative sign of the divisor.In the fourth example, we use -123 mod 50. The result is 27 because it follows the divisor's sign.Example 2: In this example, we will perform the division by zero case. Java // Java program to show ArithmeticException with floorMod() import java.lang.Math; public class Geeks { public static void main(String[] args) { int x = 200; int y = 0; System.out.println("Result: " + Math.floorMod(x, y)); } } Output:Exception in thread "main" java.lang.ArithmeticException: / by zeroExplanation: In this example, we try to divide 200 by 0, which is not allowed in Java. So the output of the program throws an ArithmeticException.When to Use floorMod() Instead of %We should use floorMod() when:We want the result to match the sign of the divisor.We are dealing with negative numbers and want consistent behavior.We are implementing modular arithmetic such as clock or calendar calculations. 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