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Changed return type of eval functions #1

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4 changes: 2 additions & 2 deletions Exercises/Lesson 3/unit3- exercises.tex
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Expand Up @@ -55,7 +55,7 @@
}}\\

\exercise{
\functionEx{eval}{(expr1: Expr): Expr}{
\functionEx{eval}{(expr1: Expr): number}{
The function allows to evaluate arithmetic expressions. An arithmetic expression is defined as a discriminated union with the following cases:

\begin{itemize}[noitemsep]
Expand All @@ -70,7 +70,7 @@
}}\\

\exercise{
\functionEx{eval}{(expr1: Expr) => (stack: List<Tuple<string, number>>): Expr}{
\functionEx{eval}{(expr1: Expr) => (stack: List<Tuple<string, number>>): number}{
Extend the previous version of the function \texttt{eval} by supporting also variables. Variables are another case of the union. Evaluating a variable means looking it up in the \texttt{stack}. A \texttt{stack} is a list of tuple mapping a variable name to its value. If the lookup is successful \texttt{eval} returns the value of the variable, otherwise it throws an error.
}}\\

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