How to raise a number to a power?

rust operators exponentiation
Matthias Braun picture Matthias Braun · Jul 6, 2018 · Viewed 21.5k times · Source

I was trying to raise an integer to a power using the caret operator (^), but I am getting surprising results, e.g.:

assert_eq!(2^10, 8);

How can I perform exponentiation in Rust?

Answer

Matthias Braun picture Matthias Braun · Jul 6, 2018

Rust provides exponentiation via methods pow and checked_pow. The latter guards against overflows. Thus, to raise 2 to the power of 10, do:

let base: i32 = 2; // an explicit type is required
assert_eq!(base.pow(10), 1024);

The caret operator ^ is not used for exponentiation, it's the bitwise XOR operator.

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