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Compile-time calculation: Difference between revisions
Added Rust example
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func factorial nr if nr = 1 return 1 else return nr * factorial(nr-1) ok
</lang>
=={{header|Rust}}==
The Rust compiler can automatically do optimizations in the code to calculate the factorial.
<lang rust>fn factorial(n: i64) -> i64 {
let mut total = 1;
for i in 1..n+1 {
total *= i;
}
return total;
}
fn main() {
println!("Factorial of 10 is {}.", factorial(10));
}</lang>
If we compile this with <code>rustc factorial.rs -O --emit asm</code> and inspect the outputted assembly, we can see <code>movq $3628800, (%rsp)</code>. This means the result of 3628800 was calculated in compile-time rather than run-time.
=={{header|Seed7}}==
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