Runtime evaluation/In an environment: Difference between revisions
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(Scala solution added) |
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<code>eval</code> can then use the local variable <code>x</code> in this context. |
<code>eval</code> can then use the local variable <code>x</code> in this context. |
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=={{header|Scala}}== |
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<lang Scala>object Eval extends App { |
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def evalWithX(expr: String, a: Double, b: Double)= |
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{val x = b; eval(expr)} - {val x = a; eval(expr)} |
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println(evalWithX("Math.exp(x)", 0.0, 1.0)) |
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}</lang> |
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=={{header|Scheme}}== |
=={{header|Scheme}}== |
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Almost identical to the [[Common Lisp]] version above. |
Almost identical to the [[Common Lisp]] version above. |
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(at-b (eval `(let ((x ',b)) ,prog)))) |
(at-b (eval `(let ((x ',b)) ,prog)))) |
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(- at-b at-a)))</lang> |
(- at-b at-a)))</lang> |
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=={{header|Sidef}}== |
=={{header|Sidef}}== |
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