find the nth triangular number in rust

To find the nth triangular number in Rust, we can use the following formula:

main.rs
Tn = n * (n + 1) / 2

21 chars
2 lines

where Tn is the nth triangular number.

We can use this formula in a Rust function as follows:

main.rs
fn nth_triangular_number(n: u32) -> u32 {
    n * (n + 1) / 2
}

64 chars
4 lines

This function takes an unsigned 32-bit integer n as input and returns an unsigned 32-bit integer which is the nth triangular number.

We can test this function using Rust's built-in test framework as follows:

main.rs
#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_nth_triangular_number() {
        assert_eq!(nth_triangular_number(1), 1);
        assert_eq!(nth_triangular_number(2), 3);
        assert_eq!(nth_triangular_number(3), 6);
        assert_eq!(nth_triangular_number(4), 10);
        assert_eq!(nth_triangular_number(5), 15);
    }
}

349 chars
14 lines

This test module checks if the nth_triangular_number() function returns the correct values for the input values 1 to 5.

similar rust code snippets

find the nth triangular number in rust
subtract two numbers in rust
find the variance of all elements in an array in rust
find the standard deviation of all elements in an array in rust
find the standard deviation of all values in a map in rust
add two numbers in rust
find the average of all elements in an array in rust
divide two numbers in rust
multiply two numbers in rust
find the median of all elements in an array in rust

related categories

rust
math
algorithm

gistlibby LogSnag