Do-if

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Do-if is an esolang created by User:Martsadas which uses do-if and do-while

PRINT {'Hello, World!\n'}

let $X = 0
do
  PRINT {'Hello world ', $X, '!\n"}
while $X < 10

let $X = INPN {}
let $R = 1
do
  let $R = $R * $X
  let $X = $X - 1
while $X > 1
PRINT {$X, '! = ', $R}