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Learning/Knowledge checks/Scripting for EDA Automation/Tcl fundamentals/Check

Module checkpoint

Tcl fundamentals knowledge check

Answer every question from your current understanding. After submission, compare your reasoning with the explanation and revisit any weak concept.

This check covers Tcl fundamentals. Read it first if you have not.

5 QuestionsOne Answer eachImmediate ScoreDetailed Explanations

Read→Reason→Select→Review

Question 1 of 5With `set top fifo`, what do `puts "$top"` and `puts {$top}` print?

fifo and $top$top and fifofifo and fifo

Question 2 of 5Why should expressions be written as `expr {$a + $b}` with braces?

Braces are required for expr to work with floating-point numbersBraces make expr round its result to the nearest whole numberexpr parses the values itself, avoiding double substitution and running faster

Question 3 of 5Why is it `lappend tests tb_irq` and not `lappend $tests tb_irq`?

lappend reads its list from the global namespacelappend takes a variable name and modifies that variablelappend only accepts arguments enclosed in braces

Question 4 of 5What does `catch {read_slacks $report} slacks` return when the file cannot be opened?

1, with the error message stored in slacks0, with an empty dictionary stored in slacks2, with the file name stored in slacks

Question 5 of 5In `regexp {^path\s+(\S+)} $line -> name`, what is `->`?

An operator that sends the match to the next commandA flag that makes the regular expression match greedilyA variable name that receives the whole match, by convention unused

Review every selection before submitting. You can retry after reading the explanations.

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