Mastering Go - Second Edition

Calculating Pi with high accuracy

In this section, you will learn how to calculate Pi with high accuracy using a standard Go package named math/big and the special purpose types offered by that package.

This section contains the ugliest Go code that I have even seen; even Java code looks better than this!

The name of the program that uses Bellard's formula to calculate Pi is calculatePi.go and it will be presented in four parts.

The first part of calculatePi.go follows:

package main 
 
import ( 
    "fmt" 
    "math" 
    "math/big" 
    "os" 
    "strconv" 
) 
 
var precision uint = 0 

The precision variable holds the desired precision of the calculations, and it is made global in order to be accessible from everywhere in the program.

The second code segment of calculatePi.go ...