Golang Interview Questions and Answers – Go Integer Data Types скачать в хорошем качестве

Golang Interview Questions and Answers – Go Integer Data Types

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.