Floating-point arithmetics

As described in previous recipes, the representation of the floating-point numbers also complicates the arithmetic. For general purposes, the operations on the built-in float64 are sufficient. In case more precision is needed, the math/big package comes into play. This recipe will show you how to handle this.

How to do it...

1. Open the console and create the folder chapter03/recipe04.
2. Navigate to the directory.
3. Create the main.go file with the following content:

        package main

        import (
          "fmt"
          "math/big"
        )

        const PI = `3.1415926535897932384626433832795028841971693
                    993751058209749445923078164062862089986280348253
                    421170679821480865132823066470938446095505822317
                    253594081284811174502841027019385211055596446229
                    4895493038196`
        const diameter = 3.0
        const precision = 400

        func main() {

          pi, _ := new(big.Float).SetPrec...