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uint16 is a built-in unsigned integer type in Go that represents a 16-bit (2-byte) numerical value. Because it is unsigned, it lacks a sign bit, utilizing all 16 bits strictly to represent mathematical magnitude.

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Technical Specifications

  • Memory Size: 16 bits (2 bytes)
  • Value Range: 0 to 65535 (216−12^{16} - 1)
  • Zero Value: 0
  • Type Identity: uint16 is a distinct, non-aliased primitive type.

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Syntax and Initialization

Variables of type uint16 can be declared using standard variable declaration, short variable declaration with explicit casting, or by referencing constants from the math package. 
package main

import (
	"fmt"
	"math"
)

func main() {
	// Explicit declaration
	var a uint16 = 32000

	// Short declaration requiring explicit type conversion
	b := uint16(1024)

	// Zero value initialization (defaults to 0)
	var c uint16 

	// Maximum possible value using the math package
	max := uint16(math.MaxUint16) // 65535

	// All declared variables must be used in Go
	fmt.Printf("a: %d, b: %d, c: %d, max: %d\n", a, b, c, max)
}

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Type Strictness and Conversion

Go enforces strict static typing. A uint16 cannot be implicitly combined with, compared to, or assigned to variables of other numeric types (such as int, uint8, or uint32). Explicit type conversion is mandatory to satisfy the compiler. 
package main

import "fmt"

func main() {
	var val16 uint16 = 500
	var val32 uint32 = 1000

	// INVALID: Compiler error (mismatched types uint16 and uint32)
	// sum := val16 + val32 

	// VALID: Explicit conversion aligns the types before the operation
	sum := uint32(val16) + val32
	
	fmt.Printf("Sum: %d\n", sum)
}

​
Boundary Behavior (Overflow and Underflow)

At runtime, uint16 operations that exceed the 16-bit boundary exhibit standard modular arithmetic (wraparound) behavior. Note that while runtime operations wrap around, constant expressions that overflow will be caught as compile-time errors. 
package main

import "fmt"

func main() {
	var min uint16 = 0
	var max uint16 = 65535

	// Runtime underflow: wraps around to the maximum value
	min-- 
	fmt.Println(min) // Output: 65535

	// Runtime overflow: wraps around to the minimum value (zero)
	max++ 
	fmt.Println(max) // Output: 0
}
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