Why are there int, int32, and int64 in Go? How do they differ?

In Go, there are different integer types: int, int32, int64, to ensure control over size and performance.

• int — an integer type whose size depends on the architecture: 32 bits on 32-bit systems and 64 bits on 64-bit systems. Used when the exact size is not crucial, but performance and platform compatibility are.
• int32 — always a 32-bit integer type, useful when a fixed size is needed, for example, for network protocols or binary formats.
• int64 — always a 64-bit integer type, used for large numbers or when an exact size is required.

Example:

var a int = 10        // depends on the platform
var b int32 = 20      // always 32 bits
var c int64 = 30      // always 64 bits

The choice depends on data size requirements and compatibility.