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superduper

  • 4 years ago

the exercise 1.6 in "structure and interpretation of computer programs" goes into a infinite loop. Any ideas?

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  1. superduper
    • 4 years ago
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    as i use the "new-if" provided in this exercise instead of "if" ,the "sqrt-iter" goes into infinite loop. when i print the "guess" , it print the right answer again and again. i can't figure out why. Help~~

  2. julie
    • 4 years ago
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    Thats because of applicative avaluation method. In this case all arguments of new-if should be evaluated which leads to infinite evaluation of sqrt-iter.

  3. superduper
    • 4 years ago
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    thank you :-) As the book says "the interpreter first evaluates the operator and operands and then applies the resulting procedure to the resulting arguments". :P

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