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Structure and Interpretation of Computer Programs

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It seems that DrScheme won't support the operator as a compound expression for this example.

(define (a-plus-abs-b a b) ((if (> b 0) + -) a b))

The if condition isn't recognized. Is this a limitation of DrScheme?

reznite
2 years ago

I figured it out. The language selection of DrScheme can't be Beginning Student. It has to be at least Intermediate Student. A little confusing, but the language selection only exposes certain language characteristics. Anyone using DrScheme should choose Advanced Student.

reznite
2 years ago

reznite,

I always thought the selections "Beginning Student" and "Advanced Student were associated with the HtDP-Curriculum. So why don't you choose R5RS, or choose the Module put #scheme into the first line of your source files?

Vogel
2 years ago

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Structure and Interpretation of Computer Programs

Exercise 1.4 and DrScheme