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kata-rpn's Introduction

rpn-calculator

kata de calculatrice en reverse polish notation

1 seule contrainte: le faire en TDD

reverse polish notation calculator

Reverse Polish Notation (RPN) est une notation mathématique où chaque operateur suit ses operandes.Contrairement à la notation polonaise standart, où l'opérateur précéde ses opérandes.

Des exemples valent mieux qu'un long discours:

  • 5 3 + => 5+3 => 8

  • 6 2 / => 6/2 => 3

  • 5 2- 7+ => 10

  • 7 5 2 -+ => 10

  • 3 5 8 x 7 + x => 3x((5x8)+7) => 141

  • 3 4 2 1+x+2/ => (3 + (4 x (2+1)))/2 => 7.5

  • 1 2 + 4 × 5 + 3 − => ((1+2) x 4) + 5 - 3 => 14

  • 5 4 1 2 + × + − => 5 + (4 x (1+2))

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