Runtime evaluation: Difference between revisions

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=={{header|REXX}}==

This REXX program does a:

~~<br>~~ 1) run-time evaluation of an internal expression, ~~and~~ a

:::*     run-time evaluation of an internal expression,   and

~~<br>~~ 2) run-time evaluation of a user-prompted expression.

:::*     run-time evaluation of a user-prompted expression.

<lang rexx>/*REXX program ~~to illustrate~~ ability to execute code ~~written~~ at runtime.*/

<lang rexx>/*REXX program illustrates ability to execute code entered at "runtime".*/

numeric digits 10000000

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)'

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*/

say 'enter an expression:'

pull expression

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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 done.*/</lang>

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

26 [from inside the box.

26 [from inside the box.]

bee= -2

abc= 2

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length of result=13395

left 50 bytes of result=85450982430363380319330070531840303650990159130402~~...~~

left 50 bytes of result=85450982430363380319330070531840303650990159130402···

right 50 bytes of result=~~...~~22977396345497637789562340536844867686961011228671

right 50 bytes of result=···22977396345497637789562340536844867686961011228671

</pre>