You are designing the syntax for a new language. The following example presents a loop statement in the language. In this example the tokens “aNumber” and “aResult” are the variable names. A variable name that can be created by the programmer can consist of any combination of alphanumeric characters and underscores. A variable name can be of any length. The tokens “from”, “get”, and “do” are keywords in the language. The list “1,34,21,678” is an example list of numbers from which the “aNumber” variable gets its values one by one. The list length can be of any size. The members of the list are numbers of any length and they are separated by commas. The operators “=” and “*” are keywords in the language. The language provides the operators “+”, “-”, and “/” too. Write BNF rules to specify the loop statement in this language. Call the start symbol “loop”. Please note in the context-free grammars we do not need to check what value is stored in a non-terminal. Therefore, a variable name is always a variable name no matter what name is stored in the corresponding non-terminal. We can use the same nonterminal for all occurrences of variable names. Moreover, the tokens are separated by one or more space characters. There is no need to specify space characters in the grammar. from 1,34,21,678 get aNumber do aResult = aNumber * aNum
You are designing the syntax for a new language. The following example presents a loop statement in the language. In this example the tokens “aNumber” and “aResult” are the variable names. A variable name that can be created by the programmer can consist of any combination of alphanumeric characters and underscores. A variable name can be of any length. The tokens “from”, “get”, and “do” are keywords in the language. The list “1,34,21,678” is an example list of numbers from which the “aNumber” variable gets its values one by one. The list length can be of any size. The members of the list are numbers of any length and they are separated by commas. The operators “=” and “*” are keywords in the language. The language provides the operators “+”, “-”, and “/” too. Write BNF rules to specify the loop statement in this language. Call the start symbol “loop”. Please note in the context-free grammars we do not need to check what value is stored in a non-terminal. Therefore, a variable name is always a variable name no matter what name is stored in the corresponding non-terminal. We can use the same nonterminal for all occurrences of variable names. Moreover, the tokens are separated by one or more space characters. There is no need to specify space characters in the grammar. from 1,34,21,678 get aNumber do aResult = aNumber * aNum
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