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uint8 is a built-in primitive data type in Go representing an unsigned 8-bit integer. It allocates exactly one byte of memory and strictly stores non-negative whole numbers.

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Technical Specifications

  • Memory Size: 8 bits (1 byte)
  • Minimum Value: 0
  • Maximum Value: 255 (28−12^8 - 1)
  • Zero Value: 0
  • Alias: byte

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Syntax and Initialization

You can declare and initialize a uint8 using standard Go variable declaration patterns. If uninitialized, it defaults to its zero value. 
// Explicit declaration with initialization
var maxVal uint8 = 255

// Declaration relying on zero value (defaults to 0)
var defaultVal uint8

// Short variable declaration with type conversion
inferredVal := uint8(128)

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The byte Alias

In Go, byte is a predeclared identifier that serves as a direct alias for uint8. They are entirely interchangeable and identical to the compiler. No explicit type conversion is required when assigning a uint8 to a byte or vice versa. 
var u uint8 = 65
var b byte = u // Valid: byte and uint8 are the exact same type

fmt.Printf("%T", b) // Output: uint8

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Overflow and Underflow Mechanics

Because uint8 is strictly bounded between 0 and 255, exceeding these limits results in different behaviors depending on whether the evaluation occurs at compile-time or run-time. Compile-time: Assigning an out-of-bounds constant yields a compilation error. 
// compiler error: constant 256 overflows uint8
var invalid uint8 = 256 

// compiler error: constant -1 overflows uint8
var negative uint8 = -1
Run-time: Standard arithmetic operations that exceed the bounds will silently wrap around (modulo 282^8). 
var val uint8 = 255
val++ 
// val is now 0 (Overflow wraparound)

var zero uint8 = 0
zero-- 
// zero is now 255 (Underflow wraparound)

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Type Conversion

Go requires explicit type conversion when performing arithmetic or assignments between uint8 and other integer types (like int, uint16, or int8), even if the value fits within the target type’s bounds. 
var a uint8 = 100
var b int = 200

// Invalid: mismatched types uint8 and int
// result := a + b 

// Valid: explicit conversion
result := int(a) + b

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Formatting Verbs

When using the fmt package, uint8 values can be formatted into various string representations using standard integer verbs: 
var num uint8 = 255

fmt.Printf("%d", num) // Base 10: 255
fmt.Printf("%b", num) // Base 2:  11111111
fmt.Printf("%x", num) // Base 16: ff
fmt.Printf("%c", num) // Unicode: ÿ (character representation of decimal 255)
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