f64

f64 - 32.32 Fixed-Point Arithmetic

Gas-efficient fixed-point numbers using 64-bit representation.

Format

The f64 format uses 32 bits for the integer part and 32 bits for the fractional part, providing: - Range: approximately ±2.1 × 10⁹ - Precision: approximately 2 × 10⁻¹⁰

When to Use f64

Choose f64 over f128 when:

• Gas optimization is critical
• Values stay within ±2 billion
• Precision of ~10 decimal places is sufficient

f64 operations are typically 40-60% cheaper than f128 equivalents.

Core Type

The Fixed struct represents a signed fixed-point number:

• mag: The absolute magnitude scaled by 2³²
• sign: true for negative, false for positive

Example

use cairo_fp::f64::types::fixed::FixedTrait;
use cairo_fp::f64::math::ops;

let x = FixedTrait::new_unscaled(2, false);  // 2.0
let result = ops::exp(x);  // e² ≈ 7.389

Fully qualified path: cairo_fp::f64

Modules