https://dlang.org/spec/statement.html#for-statement

Testing on DMD

I tried to test the for loop without the first semicolon.
It seems that two semicolons are required: compiler produces error.

import std;
void main()
{
    for (int i = 0 i < 10; i++)
        writeln("Hello D");
}

https://run.dlang.io/is/Pk0wbh

Conclusion

I'm confused. Do I not understand something in the specification or is it missing a semicolon?

On Wednesday, 9 August 2023 at 11:00:55 UTC, BoQsc wrote:

NoScopeNonEmptyStatement Contains a semicolon.

-Steve

On Wednesday, 9 August 2023 at 11:00:55 UTC, BoQsc wrote:

From the perspective of the parser, the semicolon is part of the initialization if it’s a simple one. The initialization can be more complex, though, formed by a braced sequence of statements, where the closing brace suffices to indicate the end of the initialization statement. This is valid D code:

void main()
{
    import std.stdio;
    for ({ int x = 1; double d = 3.14; } x < 10; ++x, d *= 10)
    {
        writeln(x, " ", d);
    }
}

Notice that the closing brace before x < 10 has no semicolon following it, and if you place on there, it won’t compile. I’m not saying you should write code like that.

On Wednesday, 9 August 2023 at 13:01:37 UTC, Quirin Schroll wrote:

void main()
{
    import std.stdio;
    for ({ int x = 1; double d = 3.14; } x < 10; ++x, d *= 10)
    {
        writeln(x, " ", d);
    }
}

That's news to me!

On Wednesday, 9 August 2023 at 13:01:37 UTC, Quirin Schroll wrote:

void main()
{
    import std.stdio;
    for ({ int x = 1; double d = 3.14; } x < 10; ++x, d *= 10)
    {
        writeln(x, " ", d);
    }
}

Cool. That one I miss a lot in my C programs. It's not rare to have more than one loop variable of differing types. In C I have to declare one in front of the for loop, which is annoying as the scope of the variable is not the real one I would like.
These are the small things I love so much in D.