[Andromeda]

I am quite new in D programming language. I am trying to convert my C++ classes to D that involves lots of array (vector) operations. See the below two problems. First one shows that I am required to allocate memory before assigning an array to a new array. Second shows that I cannot use an array returned by a function in arithmetic operations; it seems like the D compiler wants to see brackets [] to understand that arguments to the arithmetic operations are indeed arrays. Please write your comments on how to find better ways of dealing with these problems. Thanks.

// 1.a. This does not work
import std.stdio;

real[] getvector()
{
return [10, 20, 30];
}

void main()
{
real[] a = [5, 5, 5];
real[] c;
c[] = getvector();
writeln(c);
}

// 1.b. This works
import std.stdio;

real[] getvector()
{
return [10, 20, 30];
}

void main()
{
real[] a = [5, 5, 5];
real[] c = new real[3];
c[] = getvector();
writeln(c);
}

///////////////////////////////////////////

// 2.a. This does not work - Given this error:
// Error: invalid array operation c[] = getvector() + a[] (did you forget a [] ?)

import std.stdio;

real[] getvector()
{
return [10, 20, 30];
}

void main()
{
real[] a = [5, 5, 5];
real[] c = new real[3];
c[] = getvector() + a[];
writeln(c);
}

// 2.b. this works
import std.stdio;

real[] getvector()
{
return [10, 20, 30];
}

void main()
{
real[] a = [5, 5, 5];
real[] c = getvector();
c[] += a[];
writeln(c);
}

[DrakeMagi]

i just started learning d too.