ghci - Prefix form of unary operator in Haskell -


जीएचसीआई में:

  1. प्रील्यूड> (+3) 2
    5
  2. प्रील्यूड> (* 3) 2
    6
  3. प्रील्यूड> (/ 3) 2
    0.6666666666666666
  4. प्रील्यूड> (-3) 2
    सचमुच 3 'से & lt; इंटरैक्टिव & gt; से उत्पन्न होने वाले (संख्या (टी -> टी 1)) के लिए कोई उदाहरण: 1: 2
    संभावित सुधार: (एनएम के लिए एक उदाहरण घोषणा जोड़ें (टी - & gt; टी 1)) अभिव्यक्ति में: 3
    अभिव्यक्ति में: (- 3) 2
    की परिभाषा में: यह = (- 3) 2 < / Li>

मैं इसे वापस करने के लिए पिछले एक को कैसे ठीक कर सकता हूँ?

हास्केल का व्याकरण आपको - का उपयोग करने की अनुमति नहीं देता है। इसके बजाय घटाएं फ़ंक्शन का प्रयोग करें: 

  (घटाएं 3) 2

-

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