I would like to calculate the width of the format specifier dynamically, at runtime.

e.g int WIDTH = something.length;

then my format specifier would be: %WIDTHs instead of %9s

// ---

module test;

import std;

void main()
{
    int val = 999000;
    writefln("[%9s]", val); // [   999000]
}

// ---

On 1/23/22 13:59, forkit wrote:
> I would like to calculate the width of the format specifier dynamically, at runtime.

You use an asterisk and provide the width as an argument. This one uses the length of the name of the program:

import std;

void main(string[] args)
{
  int val = 999000;
  writefln("[%*s]", args.front.length, val); // [   999000]
}

Ali

On Sunday, 23 January 2022 at 22:08:28 UTC, Ali Çehreli wrote:
>
> You use an asterisk and provide the width as an argument. This one uses the length of the name of the program:
>
> import std;
>
> void main(string[] args)
> {
>   int val = 999000;
>   writefln("[%*s]", args.front.length, val); // [   999000]
> }
>
> Ali

perfect! thanks.