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# assert_approx_eq
> a rust macro for asserting 2 numbers are approximately equal
[](https://crates.io/crates/assert_approx_eq)
[](https://travis-ci.org/ashleygwilliams/assert_approx_eq)
[](https://ci.appveyor.com/project/ashleygwilliams/assert-approx-eq)
This crate exports a macro for asserting that two numbers are approximately equal (`1.0e-6`, by default) to each other.
On panic, this macro will print the values of the expressions with their
debug representations. You can optionally add an optional diff value. If you
don't supply a diff value as an argument, `1.0e-6` is the default used.
## Usage
To use this crate, add `assert_approx_eq` as a dependency of your Rust project.
Then, you can use the macro as follows:
```rust
use assert_approx_eq::assert_approx_eq;
let a = 3f64;
let b = 4f64;
assert_approx_eq!(a, b); // panics
assert_approx_eq!(a, b, 2f64); //does not panic
assert_approx_eq!(a, b, 1e-3f64); // panics
```
You can read documentation for how to use this crate on [docs.rs](https://docs.rs/assert_approx_eq) or [view the example].
[view the example]: examples/assert_approx_eq.rs
## License
Licensed under either of
* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally
submitted for inclusion in the work by you, as defined in the Apache-2.0
license, shall be dual licensed as above, without any additional terms or
conditions.
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