On Sunday, 30 April 2017 at 05:53:09 UTC, Andrew Edwards wrote:
>             string line;
>             parse!int((line = readln)).writeln;
> 

is there a reason you mix normal call and ufc or just some style?
you can do this and remove some ()

(line = readln).parse!int.writeln;

On Sunday, 30 April 2017 at 02:07:48 UTC, JV wrote:
> Hello i'm kinda new to D language and i wanted to make a simple program
> but somehow my input does no go to my if statements and just continues to ask for the user to input.Kindly help me

One way would be:

    import std.stdio;
    int x;
    readf (" %s", &x);

The "%s" means "default format for the type", which is I believe "%d" (decimal) for the int type.  The space before "%s" is to skip all whitespace before the actual input, it will matter when you read your second integer:

    readf ("%s%s", &x, &y); // error, got space for y instead of a digit
    readf ("%s %s", &x, &y); // ok

Another way is:

    import std.conv, std.stdio, std.string;
    int x = readln.strip.to!int;

Here, we read the line with readln, strip the trailing whitespace with strip, and convert the resulting string to an int with to!int.

Also, you might want to look at the corresponding chapter in Ali Cehreli's book:
http://ddili.org/ders/d.en/input.html

Ivan Kazmenko.