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Learn how to write the factorial program in java using loop and recursion. Factorial of n is the product of all positive descending integers from n to 1.
Jul 30, 2023 · Learn how to write a program for the factorial of a number in Java using iterative, recursive and one-line solutions. See the formula, examples and complexity analysis of each method.
Learn how to calculate the factorial of a positive number using for, while and BigInteger loops in Java. See examples, output and explanations of the code.
Jul 19, 2024 · Learn how to calculate factorial in Java using different methods, such as standard values, loops, function, recursion, and while loop. See the code examples, outputs, and explanations for each method.
- Overview
- Factorial For Numbers Up to 20
- Factorial For Numbers Greater Than 20
- Conclusion
- GeneratedCaptionsTabForHeroSec
Given a non-negative integer n, factorial is the product of all positive integers less than or equal to n. In this quick tutorial, we’ll explore different ways to calculate factorial for a given number in Java.
2.1. Factorial Using a for Loop
Let’s see a basic factorial algorithm using a forloop: The above solution will work fine for numbers up to 20. But, if we try something bigger than 20, then it will fail because results would be too large to be fit into a long, causing an overflow. Let’s see a few more, noting that each of these will only work for small numbers.
2.2. Factorial Using Java 8 Streams
We can also use the Java 8 Stream APIto calculate factorials quite easily: In this program, we first use LongStream to iterate through the numbers between 1 and n. We then used reduce(), which uses an identity value and accumulator function for the reduction step.
2.3. Factorial Using Recursion
And let’s see another example of a factorial program, this time using recursion:
3.1. Factorial Using BigInteger
As discussed before, the long datatype can be used for factorials only for n <= 20. For larger values of n, we can use the BigInteger class from the java.math package, which can hold values up to 2Integer.MAX_VALUE:
3.2. Factorial Using Guava
Google’s Guavalibrary also provides a utility method for calculating factorials for larger numbers. To include the library, we can add its the guava dependency to our pom: Now, we can use the static factorial method from the BigIntegerMathclass to calculate the factorial of a given number:
In this article, we saw a few ways of calculating factorials using core Java as well as a couple of external libraries. We first saw solutions using the long data type for calculating factorials of numbers up to 20. Then, we saw a couple of ways to use BigInteger for numbers greater than 20. The code presented in this article is available over on G...
Learn different ways to calculate factorial for a given number in Java, using loops, streams, recursion, and external libraries. See examples, code, and explanations for each method.
3 days ago · Learn how to calculate the factorial of a number using recursive functions, loops, and ternary operators in C, C++, Java, Python, and other languages. See examples, time complexity, and auxiliary space analysis.
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Learn how to write a Java program to calculate the factorial of a number using different methods, such as for loop, while loop, functions, and recursion. See examples, explanations, and output for each method.
