*We can calculate the absolute value of a number using the abs() method. We have to specify the numeric type before we call the abs method, for example, if we want a 32-bit signed integer we need to put i32 after the number.*

*This tutorial will go through how to calculate the absolute value of a numeric value in Rust with code examples. *

## Example #1: Absolute Value of a Signed Integer

Let’s look at an example where we want to calculate the absolute value of an integer:

fn main() { let num = -4 let abs_num = num.abs(); println!("{}", abs_num); }

In the above code, we define the number and then call the abs() method. Let’s run the code to see what happens:

error[E0689]: can't call method `abs` on ambiguous numeric type `{integer}` --> src/main.rs:3:23 | 3 | let abs_num = num.abs(); | ^^^ | help: you must specify a type for this binding, like `i32` | 2 | let num: i32 = -4; | ~~~~~~~~

The error occurs because we did not define the specific numeric type. We need to put an i32 after the number so that Rust knows the number is a 32-bit signed integer. Let’s look at the revised code:

fn main() { let num = -4i32 let abs_num = num.abs(); println!("{}", abs_num); }

Let’s run the code to see the result:

4

We successfully calculated the absolute value of -4, which is 4

The absolute method abs() is an available method for most numeric types.

## Example #2: Absolute Value of a Signed Float

Let’s look at an example where we want to calculate the absolute value of a floating point. We need to put an f32 after the number so that Rust knows the number is a 32-bit signed float.

fn main() { let num = -3.4f32; let abs_num = num.abs(); println!("{}", abs_num); }

Let’s run the code to see the result:

3.4

We successfully calculated the absolute value of -3.4, which is 3.4.

## Summary

Congratulations on reading to the end of this tutorial! For further reading on Rust, go to the articles:

- How to Concatenate Strings in Rust
- How to Do Bubble Sort in Rust
- What is the Difference Between iter, into_iter and iter_mut in Rust?

Have fun and happy researching!