• Python

s = 'Our sun has ' + str(x) + ' planets'

• Python

s = 'Our sun has {} planets'.format(x)

• Python

s = f'Our sun has {x} planets'

• Python

s = 'Our sun has %s planets' % x

• C

char s[32] = "";
sprintf(s, "Our sun has %i planets", x);

• C++

s = std::format("Our sun has {} planets", x);

• C#

var s = $"Our sun has {x} planets";

• Dart

var s = "Our sun has $x planets";

• Elixir

s = "Our sun has #{x} planets"

• Fortran

  write (unit=s,fmt='(*(G0))') "Our sun has ",x," planets."

• Go

s := fmt.Sprintf("Our sun has %d planets", x)

• JS

let s = `Our sun has ${x} planets`;

• Java

String s = "Our sun has %s planets".formatted(x);

• Java

String s;
StringBuilder b = new StringBuilder();
Formatter f = new Formatter(b);
f.format("Our sun has %s planets", x);
f.flush();
s = b.toString();

• Java

String s = String.format("Our sun has %s planets", x);

• Java

String f = "Our sun has {0,number} planets",
       s = format(f, x);

• Kotlin

val s = "Our sun has $x planets"

• Lua

local str=string.format("Our sun has %d planets",x)

• PHP

$s = "Our sun has {$x} planets";

• Pascal

s := Format('Our sun has %d planets',[x]);

• Pascal

s := 'Our sun has '+x.ToString+' planets';

• Pascal

s := 'Our sun has '+IntToStr(x)+' planets';

• Perl

$s = "Our sun has $x planets"

• Ruby

s = "Our sun has #{x} planets."

• Rust

let s = format!("Our sun has {x} planets");

• Rust

let s = format!("Our sun has {} planets", x);