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Runtime evaluation: Difference between revisions
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:::* run-time evaluation of an internal expression, and
:::* run-time evaluation of a user-prompted expression.
<lang rexx>/*REXX program illustrates the ability to execute code entered at
numeric digits 10000000 /*ten million digits should do it. */
bee=51
stuff= 'bee=min(-2,44); say 13*2 "[from inside the box.]"; abc=abs(bee)'
interpret stuff
say 'bee=' bee
say 'abc=' abc
say
/* [↓] now, we hear from
say 'enter an expression:'
pull expression
say
say 'expression entered is:' expression
say▼
interpret '?='expression
▲say
say 'length of result='length(?)
say ' left 50 bytes of result='left(?,50)
say 'right 50 bytes of result=···'right(?, 50) /*stick a fork in it, we're all done. */</lang>
'''output''' when using the input: <tt> 2**44497 - 1 </tt>
<br>which happens to be the 27th Mersenne prime.
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