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As stated earlier, one restriction that Little C has relative to the full C grammar is that the objects of statements such as if even if single statements must be blocks of code enclosed between curly braces The reason for this is that it greatly simplifies the find_eob( ) function, which is used to find the end of a block of code after one of the control statements executes The find_eob( ) function simply looks for a closing curly brace to match the one that starts the block You might find it an interesting exercise to remove this restriction One approach to this is to redesign find_eob( ) so that it finds the end of a statement, expression, or block Keep in mind, however, that you will need to use a different approach to finding the end of the if, while, do-while, and for statements when they are used as single statements Expanding Little C There are two general areas in which you can expand and enhance the Little C interpreter: C features and ancillary features Some of these are discussed briefly in the following sections Adding New C Features There are two basic categories of C statements you can add to Little C The first is additional action statements, such as the switch, the goto, and the break and continue statements You should have little trouble adding any of these if you study closely the construction of the statements that Little C does interpret The second category of C statement you can add is support for new data types Little C already contains the basic ''hooks" for additional data types For example, the var_type structure already contains a field for the type of variable To add other elementary types (for example, float, double, and long), simply increase the size of the value field to the size of the largest element you wish to hold Supporting pointers is no more difficult than supporting any other data type However, you will need to add support for the pointer operators to the expression parser Once you have implemented pointers, arrays will be easy Space for an array should be allocated dynamically using malloc( ), and a pointer to the array should be stored in the value field of var_type The addition of structures and unions poses a slightly more difficult problem The easiest way to handle them is to use malloc( ) to allocate space for an object and then store a pointer to the object in the value field of the var_type structure (You will also need special code to handle the passing of structures and unions as parameters) To handle different return types for functions, you will need to make use of the ret_type field in the func_type structure This field defines what type of data a function returns It is currently set, but otherwise unused You might also want to try allowing Little C to accept //-style comments This change takes place within get_token( ) and is easy to implement One final thought if you like to experiment with language constructs, don't be afraid to add a nonC extension By far the most fun I've had with language
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interpreters is making them do things not specified by the language If you want to add a Pascal-like REPEAT-UNTIL construct, for example, go ahead and do it! If something doesn't work the first time, try finding the problem by printing out each token as it is processed Adding Ancillary Features Interpreters give you the opportunity to add several interesting and useful features For example, you can add a trace facility that displays each token as it is executed You can also add the ability to display the contents of each variable as the program executes Another feature you might want to add is an integrated editor so that you can ''edit and go" instead of having to use a separate editor to create your C programs
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