high precision go consts

hilowconst.go

package main

import "fmt"

func main() {
	// ------------------------------------------------
	// LOSS OF PRECISION
	// ------------------------------------------------
    
	// const Pi lives in the ideal numbers universe which has at least 256-bit high-precision
	const Pi = 3.14159265358979323846264338327950288419716939937510582097494459

	// when evaluated, it'll be converted into a float64
	fmt.Printf("Pi            : %.50g\n", Pi)
	
	// ------------------------------------------------
	// HIGH AND LOW PRECISION DIFFERENCE
	// ------------------------------------------------

	const uta, utb = 0.116, 45.0         // untyped constants
	const ta, tb float64 = uta, utb      // typed constants
    
	highPrecision := uta * utb
	lowPrecision := ta * tb

	// high precision calculation - untyped constants - ideal numbers space
	fmt.Printf("high-precision: %.50f\n", highPrecision)

	// low precision calculation - typed constants
	fmt.Printf("low precision : %.50f\n", lowPrecision)
    
	fmt.Printf("difference    : %.50f\n", highPrecision - lowPrecision)
}