How can I port this C++ code to Rust:
auto sgnR = (R >= 0.) ? 1. : -1.;
I have seen some examples with the match
keyword, but I don't understand how it works.
Rust does not have the ternary operator because it's not needed. Everything evaluates to some value, and if / else statements are no exception: let r = 42.42; let sgn_r = if r >= 0.
We use the ternary operator in C to run one code when the condition is true and another code when the condition is false. For example, (age >= 18) ? printf("Can Vote") : printf("Cannot Vote");
Rust does not have the ternary operator because it's not needed. Everything evaluates to some value, and if
/ else
statements are no exception:
let r = 42.42; let sgn_r = if r >= 0. { 1. } else { -1. };
You'll note that I've also changed your variable names to be idiomatic Rust. Identifiers use snake_case
.
Do not be confused by the ?
operator that Rust does have. This is called the "try operator" and is used to propagate errors.
Specifically for this code, it's likely you should use f64::signum
:
let r = 42.42_f64; let sgn_r = r.signum();
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