Can you explain what is meant by the memory allocation mechanism in a system?

The memory allocation mechanism in a system is the process by which the operating system or runtime environment (such as Go runtime) reserves a memory area for storing data and program code.

In Go, memory allocation occurs automatically thanks to the built-in garbage collector. When a new variable or object is created, the system allocates memory for them on the heap or stack.

• The stack is used for local variables and is quickly freed when exiting a function.
• The heap is used for objects with dynamic lifetimes, and its memory is managed by the garbage collector.

Example of memory allocation in Go:

package main

import "fmt"

func main() {
    x := 10          // variable on the stack
    p := new(int)    // memory allocation on the heap
    *p = 20
    fmt.Println(x, *p)
}

Here, new(int) allocates memory for an integer on the heap and returns a pointer to it.