GoLang nextafter & %g?

Question

I'm just going through tutorials of GoLang because I'm curious to learn a more general language (only know javascript). Tut

I dont understand whats happening with %g and math.Nextafter means? After reviewing the documentation it helps little.

Question: Could anyone give me a better overview of the %g syntax and nextafter() method; perhaps a digestible usecase?? Here's links to documentation:fmt // nextAfter

package main

import (
    "fmt"
    "math"
)

func main() {
    fmt.Printf("Now you have %G problems.",
        math.Nextafter(2, 3))
}

score 4 · Accepted Answer · edited May 23 '17 at 11:54

4

Regarding the %g syntax, see fmt syntax:

%g  whichever of %e or %f produces more compact output
%e  scientific notation, e.g. -1234.456e+78
%f  decimal point but no exponent, e.g. 123.456

The float64 returned by NextAfter() will be presented using the scientific notation or decimal point, depending on which is more compact.

For the returned value of NextAfter, see "Why does math.Nextafter(2,3) in Go increment by 0.0000000000000004 instead of 0.0000000000000001?"

You will see plenty of Go string formatting in "Go by Example: String Formatting": one parameter for the format, one for the value to be formatted.
Those formats ("verb") are listed in `pkg/fmt/.

edited May 23 '17 at 11:54

Community

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answered Nov 30 '14 at 18:56

VonC

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why does the printf function take two parameters? – Armeen Harwood Nov 30 '14 at 18:59
@MatthewHarwood: Read the documentation for printf. – Robert Harvey Nov 30 '14 at 19:01
Yeah I will. There's just a ton of things outside my realm of understanding. For instance types float64. I'll just read more. – Armeen Harwood Nov 30 '14 at 19:05
1

@MatthewHarwood `float64` is a sixty-four bit floating-point number. See http://en.wikipedia.org/wiki/Double-precision_floating-point_format – Robert Harvey Nov 30 '14 at 19:08

GoLang nextafter & %g?

1 Answers1