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int32 is a built-in, statically typed, signed integer data type in Go that occupies exactly 32 bits (4 bytes) of memory. It represents whole numbers using two’s complement binary representation, ensuring a fixed memory footprint regardless of the underlying hardware architecture.

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Technical Specifications

  • Memory Size: 32 bits (4 bytes)
  • Sign: Signed (supports positive, negative, and zero)
  • Minimum Value: -2,147,483,648 (math.MinInt32)
  • Maximum Value: 2,147,483,647 (math.MaxInt32)
  • Zero Value: 0

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Syntax and Initialization

You can declare an int32 using standard variable declaration, short variable declaration with type conversion, or the new keyword. 
// Explicit declaration
var a int32 = 2147483647

// Declaration relying on the zero value (0)
var b int32

// Short declaration with explicit type conversion
c := int32(-1000)

// Pointer to an int32 allocated with zero value
d := new(int32)

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Type Strictness and Conversion

Go enforces strict typing. int32 is treated as a distinct type from int, int16, int64, and uint32. Even on a 32-bit system where the standard int type is 32 bits wide, the compiler will not implicitly convert between int and int32. Explicit type conversion is mandatory for arithmetic operations or assignments involving mixed numeric types. 
var val32 int32 = 50
var valInt int = 100

// Invalid: mismatched types int32 and int
// result := val32 + valInt 

// Valid: explicit conversion
result := val32 + int32(valInt)

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The rune Alias

In Go, rune is a built-in type alias for int32. They are syntactically and semantically identical to the compiler. While rune is conventionally used to represent a Unicode code point, it is fully interchangeable with int32 without explicit conversion. 
var myInt int32 = 65
var myRune rune = 'A' // 'A' is an untyped constant representing 65

// Valid: No conversion needed because rune is an alias for int32
myInt = myRune

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Overflow Behavior

If an arithmetic operation exceeds the bounds of int32, Go silently wraps around using two’s complement arithmetic. It does not panic or throw an exception at runtime. 
var max int32 = 2147483647 // math.MaxInt32
max = max + 1              // Wraps around to -2147483648 (math.MinInt32)
(Note: Constant expressions evaluated at compile-time will trigger a compiler error if they overflow int32 bounds; wrap-around only occurs at runtime.)
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