index.md

---

title: Negate
slug: WebAssembly/Reference/Numeric/Negate

---

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The neg instructions, short for negate, are used to negate a number. That is, turn a positive number into a negative number and a negative number into a positive number.

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Syntax

;; load a number onto the stack
f32.const 2.7

;; round down
f32.neg

;; the top item on the stack will now be 2

Instruction	Binary opcode
f32.neg	0x8c
f64.neg	0x9a