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Knowledge Conversion in Go |

Changing knowledge from one sort to a different is a quite common follow in programming. In Go (or Golang), a statically typed language, that is notably vital to control knowledge in some ways, akin to changing values from int to drift, concatenating numeric values to strings, and so forth. This programming tutorial illustrates completely different knowledge conversion strategies sometimes utilized in Go programming.

Overview of Go Knowledge Sorts

Knowledge sorts in Go are used to categorise the kind of knowledge – akin to an integer, which is used to characterize a non-fractional quantity, floating-point to characterize fractional values, and strings to characterize assortment of alphanumeric values. Word that Go is a statically typed language, which implies that if builders outline a variable of a sort it could retailer values of that sort solely. At a later level, if we resolve to retailer one other sort of worth (akin to integer to string or vice versa) it’s not potential; or relatively, it’s potential solely via knowledge sort conversion. Go has three primary knowledge sorts:

  • Bool: Represents boolean true or false values
  • Numeric: Numeric values cane be integer, floating-point, and complicated sorts
  • String: Represents string or textual content values

Learn: The way to Work with Strings in Go and Golang

Golang Code Instance: Knowledge Sorts

Beneath is a fast Go code instance exhibiting methods to retailer varied knowledge sorts in variables after which print these values to the customers display screen:

bundle fundamental
import "fmt"
func fundamental() {
	var boolVal bool = true
	var intVal int = 10
	var floatVal float32 = 1.22
	var strVal string = "Hey!"


Operating this program in your built-in growth atmosphere (IDE) or code editor would end result within the following output:


Quantity Illustration in Go

Early on in computing historical past, C compilers solely supported 16-bit int and 32-bit lengthy values for non-fractional numbers. With the ever-evolving occasions, C-based compilers have modified so much and now have full help of 64-bit programs. Nonetheless, the conversion from a sort akin to uint32_t – which represents a 32-bit unsigned integer to unsigned int – isn’t all the time secure.

The issue of unsafe conversion exists in C due to the core adjustments it has to make to assimilate the help for evolving programs. Go, being a newer language, has supplied specific sized integer and floating level sorts from the very starting. In Go, the sort uint64 is all the time a 64-bit unsigned integer and uint16 is all the time a 16-bit signed integer. Go additionally supplies int and uint sorts which might be the native measurement of the machine, or at the least 32-bit. Not like C, which helps implicit forged between int to any explicitly sized sorts, Go doesn’t help implicit sort conversion. That is to make sure that no unsafe conversion happens.

Go has many integer knowledge sorts to select from. Corresponding to:

  • Signed: int, int8, int16, int32, int 64
  • Unsigned: uint, uint8, uint16, uint32, uint 64

Equally, there are floating-point sorts, akin to:

Different knowledge sorts in go embrace: bool: bool and string: string.

Learn: Greatest On-line Programs to Study Go and Golang

Golang Knowledge Conversion

As talked about, there is no such thing as a implicit conversion from one quantity to a different in Golang; as an alternative, builders should use a few of Go’s built-in features to transform from one sort to a different. Beneath are some examples exhibiting methods to convert knowledge sorts in Go:

var boolVal bool = true
var intVal int = 10
var intVal2 int32 = 10
var floatVal float32 = 1.22
var floatVal2 float64 = 2.34
var strVal string = "Hey!"

intVal = int(intVal2)
intVal2 = int32(floatVal)
floatVal2 = float64(floatVal)
floatVal = float32(intVal2)

We’ll dive additional into what the above code means within the following sections.

The way to Convert Strings and Numbers in Go

A typical conversion programmers must carry out is between strings and numbers. Go supplies an unique bundle for string conversion often called strconv bundle. Nonetheless, the only conversion is carried out by the fmt bundle, whereas utilizing features like Printf and Scanf.

That being stated, the strconv bundle is the usual for implementing conversion to – and from – string illustration to primary knowledge sorts. This bundle supplies varied features to carry out conversions. Builders can optionally specify the bottom of the quantity. Here’s a quite simple code instance exhibiting methods to use fmt and strconv in Go:

bundle fundamental

import (

func fundamental() {
	var intVal int
	fmt.Scanf("%d", &intVal)
	strVal := strconv.FormatInt(int64(intVal), 10)
	val, _ := strconv.ParseInt(strVal, 16, 64)
	fmt.Printf("%d", val)

Within the above Golang code instance we enter a decimal integer worth via the keyboard after which constructed a string from the numeric worth enter. At this level, the quantity is transformed to a string. After that, we parsed the string as an integer of base-16. Lastly, we used the Printf() operate to output the worth as a base-10 integer once more.

The way to Convert Between Numbers and Pointers in Go

Pointers are reminiscence areas and they’re additionally numbers, proper? So, the logic would observe, they should be simply convertible and used as numbers. Outdated programming languages, like BCPL, really handled pointers and numbers in the same method. Due to that, we might technically carry out pointer arithmetic and another unusual stuff. Then, C separated the concept and made an specific distinction between numbers and pointers, however nonetheless allowed some implicit conversion between pointers and integers. Due to this fact, it additionally permits some type of pointer arithmetic. Pointer arithmetic is definitely well-liked amongst C programmers however it’s unsafe. Now, Go has made a whole distinction between pointers and integers. Nonetheless, conversion remains to be potential utilizing unsafe packages. Right here is an instance of methods to convert between numbers and pointers in Go:

bundle fundamental

import (

func fundamental() {
	greet := "hi there!"
	addrGreet := unsafe.Pointer(&greet)
	fmt.Printf("Tackle of greet is %dn", addrGreet)
	addrGreetToStr := (*string)(addrGreet)
	fmt.Printf("pointer to string: %sn", *addrGreetToStr)
	addr := uintptr(addrGreet)
	addr += 4 // This may increasingly trigger panic. undefined conduct.
	str := (*string)(unsafe.Pointer(addr))
	fmt.Printf("String from pointer: %sn", *str)

The above Golang code instance converts the pointer – or the deal with of the string worth (which, in spite of everything, can also be a quantity) to string forwards and backwards and tries to carry out some arithmetic. This system executes high-quality, however on the level the place we’re doing pointer math, this system might panic and print some random values and can exit, lastly, with a runtime error (at the least in my case. It’s innocent to attempt by yourself if you want).

The title of the bundle really means that Go doesn’t encourage implementing this type of conduct. In truth, on the outset of the unsafe bundle documentation, it states: “Bundle unsafe incorporates operations that step across the sort security of Go packages. Packages that import unsafely could also be non-portable and usually are not protected by the Go 1 compatibility pointers.”

In Go, it’s really potential to disable use of unsafe operations by passing the flag -u to the Go compiler.

You possibly can study extra about pointers in our tutorial: The way to Use Pointers in Go.

Closing Ideas on Go Knowledge Conversion

Conversion in Go is all the time a cautious affair. Lack of data, erratic or undefined conduct in conversions isn’t unusual. Nonetheless, programmers can not utterly do with out conversion. We should use the usual manner given by Go to carry out any form of conversion between knowledge sorts. Nonetheless, Go has made it a lot safer to transform between knowledge sorts – at the least compared to its predecessors.

Learn extra Go and Golang programming tutorials.



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