. . . . . . . . returns a value after performing its specific task.

Here is an example of a function procedure:

function add(x, y) {
return x + y;
}

This function procedure can be called by another block of code, such as this:

var z = add(1, 2);

The value of z will be 3.

Here is an example of a sub procedure:

sub printMessage() {
print("Hello, world!");
}

This sub procedure cannot be called by another block of code. It can only be called by the block of code that contains it.

Here is an example of a sub block:

{
var x = 1;
var y = 2;
}

This sub block is contained within another block of code. It cannot be called by another block of code.

Here is an example of a structure:

struct Person {
string name;
int age;
}

This structure is a data type that can be used to store data. It cannot be used to perform a task.