Golang Interview Questions and Answers – Go Integer Data Types

Описание: In this complete guide to Go integer types, you’ll learn everything you need to understand how integers work in Go — from basic types to advanced low-level operations.

We start with the two main categories of integer types: architecture-dependent types like int, uint, and uintptr, and fixed-size architecture-independent types like int8, int16, int32, int64, and their unsigned versions. You’ll learn when portability matters and why int is usually best for everyday code.

We explain type aliases like byte and rune, and why they behave differently from distinct types such as int and int64. Even on a 64-bit system, int and int64 are different types and require explicit conversion.

You’ll understand zero values, short variable declarations, and how untyped constants work with arbitrary precision at compile time. We also cover number literals in decimal, binary, octal, and hexadecimal, including underscore rules for readability.

The video explores explicit type conversions, silent overflow behavior, signed vs unsigned pitfalls, and how Go handles division and remainder with negative numbers. You’ll see why overflow wraps around at runtime and how to detect it safely using helper functions or the math/bits package introduced in newer Go versions.

We dive deep into bitwise operations, bit clear (AND NOT), shift rules, negative shift panics, and practical tricks like checking even numbers, detecting powers of two, setting, clearing, and toggling bits.

You’ll also learn about:
00:00 Go Integer Data Types Overview
00:17 Architecture-Dependent vs Independent Integers
00:55 Type Alias vs Distinct Types
01:54 Zero Values and Default int Inference
02:44 Integer Literals (Decimal, Binary, Octal, Hex, Underscores)
03:43 Untyped Constants and Arbitrary Precision
04:53 Explicit Type Conversion and Data Loss Risks
05:55 Min/Max Integer Constants (math package)
06:42 Arithmetic Rules, Division, Remainder, Increment
07:38 Integer Overflow (Silent Wraparound)
08:25 Detecting Overflow Safely (Helper Functions, bits Package)
10:08 Bitwise Operations and Shifts
11:01 Bit Clear (AND NOT) Operator
11:39 Negative Shift Behavior
12:09 Practical Bit Tricks (Even, Power of Two, Flags)
13:05 math/bits Package Overview
13:38 Printing Integers in Different Formats (Printf)
14:39 String ↔ Integer Conversion (strconv)
15:28 unsafe.Sizeof and Struct Padding
16:20 Integer Type Conversion Rules
17:01 Comparison Operators and Type Matching
17:56 byte vs rune
18:35 big.Int for Large Numbers
19:19 int64 vs big.Int
19:56 Generics with Integer Types
20:45 cmp.Ordered in Go 1.21
21:31 Endianness and Binary Encoding
22:25 Atomic Integer Operations
22:55 iota for Constant Sequences
23:43 Finding int Size on Current Platform
24:11 Why Use Standard int for Performance
24:49 Best Type for Loop Counters
25:03 Shifts vs Multiply/Divide Optimization
25:37 Integer Types in Standard Library APIs
26:16 JSON Large Integer Precision Issues
26:48 uintptr and Pointer Arithmetic Safety
27:32 Bloom Filter with Bits
28:16 Bitset Implementation (Set and Has)
29:10 IPv4 to Integer Conversion
30:00 Runtime Type Checking with Type Switch


You’ll also get reference tables to help you choose the right integer type for your use case.

This is a complete deep dive into Go integer behavior — practical, low-level, and performance-focused.