Runtime evaluation/In an environment: Difference between revisions
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<lang javascript>evalWithX('Math.exp(x)', 0, 1) // returns 1.718281828459045</lang>
=={{header|Lua}}==
<lang lua>
code = loadstring"return x^2" --this doesn't really need to be input, does it?
val1 = setfenv(code, {x = io.read() + 0})()
val2 = setfenv(code, {x = io.read() + 0})()
print(val2 - val1)
</lang>
=={{header|Metafont}}==
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