February 2018
Intermediate to advanced
340 pages
9h 43m
English
Content preview from Go Standard Library Cookbook
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How to do it...
- Open the console and create the folder chapter03/recipe04.
- Navigate to the directory.
- 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(precision).SetString(PI) d := new(big.Float).SetPrec(precision).SetFloat64(diameter) circumference := new(big.Float).Mul(pi, d) pi64, _ := pi.Float64() fmt.Printf("Circumference big.Float = %.400f\n", circumference) fmt.Printf("Circumference ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.