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Write a Rust function to find the factorial of a given number using recursion.

Utpal Vishwas 357 20 Jun 2023

Write a Rust function to find the factorial of a given number using recursion.

rust programsrust
Updated 24 Jun 2023
Utpal Vishwas
Utpal Vishwas

Student

I am Utpal Vishwas from Uttar Pradesh. Have completed my B. Tech. course from MNNIT campus Prayagraj in 2022. I have good knowledge of computer networking.

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1 Answers

Aryan Kumar
Aryan Kumar 24 Jun 2023
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Sure, here is a Rust function to find the factorial of a given number using recursion:

Rust

fn factorial(n: i32) -> i32 {
  // Base case.
  if n == 0 {
    return 1;
  }

  // Recursive case.
  return n * factorial(n - 1);
}

fn main() {
  // Get the number from the user.
  let mut number = String::new();
  io::stdin().read_line(&mut number).unwrap();

  // Convert the number to an integer.
  let number: i32 = number.trim().parse().unwrap();

  // Find the factorial of the number.
  let factorial = factorial(number);

  // Print the factorial.
  println!("The factorial of {} is: {}", number, factorial);
}

This function first defines a base case. The base case is when the number is 0. In this case, the function returns 1. Otherwise, the function defines a recursive case. The recursive case is when the number is greater than 0. In this case, the function multiplies the number by the factorial of the number minus 1. Finally, the function returns the factorial.

To run this program, you can save it as a .rs file and then compile and run it using the following commands:

Code snippet

rustc factorial.rs
./factorial

This will prompt you to enter a number. Enter a number and press Enter. The program will then print the factorial of the number.

For example, if you enter the number 5, the program will print the following output:

Code snippet

The factorial of 5 is: 120
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