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 ability to execute code entered at "runtime".*/

<lang rexx>/*REXX program illustrates the ability to execute code entered at runtime (from C.L.)*/

numeric digits 10000000 /*ten million digits should do it*/

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 da user*/

/* [↓] now, we hear from the user. */

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 ' left 50 bytes of result='left(?,50)"···"

say 'right 50 bytes of result=···'right(?,50)

say 'right 50 bytes of result=···'right(?, 50) /*stick a fork in it, we're all done. */</lang>

/*stick a fork in it, we're done.*/</lang>

'''output'''   when using the input: <tt> 2**44497 - 1 </tt>

<br>which happens to be the 27th Mersenne prime.