here is a link to a simple calculator in lex and yacc, implementing something like our example expression grammar calculator This is calc.lex and calc.yacc from Andrew Brinker – you may use these as youy starting point instead of the first link 1. Implement it > 2. Add and exit/quit feature, so that you can enter one expression and then use the result as the start of another expression – for example: 2+5 => 7 /2 => 3.5 3. Add variables to the grammar – this requires modifying the grammar with an assign statement so you can set the values of a variable, and a print ot display statement so you can view the contents of the variable. You may implement it as an interpreter or a compiler
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