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Arithmetic evaluation: Difference between revisions
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=={{header|Tcl}}==
{{works with|Tcl|8.5}}
The code below delivers the AST for an expression in a form that it can be immediately eval-led, using Tcl's prefix operators.
<lang Tcl>namespace import tcl::mathop::*
proc arieval str {
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} \n] {
puts "$test ..... [eval $test] ..... [eval [eval $test]]"
}</lang>▼
▲</lang>
Output:<pre>
arieval 2-2 ..... - 2 2 ..... 0
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