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Generating Data Matrix in Java Answers to Exercises

APPENDIX: Answers to Exercises
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1. What s wrong with each of the following code fragments a. The arguments to fopen() appear in reverse order. b. Once again, the arguments to fopen() are reversed. In addition, the first parameter to fscanf() contains a prompt, as if you were calling printf(). Also, the second parameter to fscanf() is defined as a char, yet the %d format specifier is used, telling fscanf() to expect an int. This will cause fscanf() to store an int-sized value in the space allocated for a char. Not good! And last, but certainly not least, this code uses fscanf() instead of fgets(). c. line is declared as a char pointer instead of as an array of chars. No memory was allocated for the string being read in by fscanf(). Also, since line is a pointer, the & in the fscanf() call shouldn t be there. Once again, we should be using fgets(). You d think we would have learned from the last example. d. This code is fine except for two problems. The file is opened for writing, yet we are trying to read from the file using fscanf(). Did you catch the fact that we once again did not use fgets() Think about how you d rewrite the last few snippets using fgets(). 2. Look in the folder 10.04 - fileReader. 3. Look in the folder 10.05 - cdFiler2.
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APPENDIX: Answers to Exercises
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1. What s wrong with each of the following code fragments a. In the next-to-last line, the address of myCat is cast to a struct. Instead, the address should be cast to a (struct Dog *). b. The typedef defines FuncPtr to be a pointer to a function that returns an int. MyFunc() is declared to return a pointer to an int, not an int. c. The declaration of myUnion is missing the keyword union. Here s the corrected declaration:
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union Number myUnion;
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d. The Player union fields must be accessed using u. Instead of myPlayer.myInt, refer to myPlayer.u.myInt. Instead of myPlayer.myFloat, refer to myPlayer.u. myFloat. e. First, myFuncPtr is not a function pointer and not a legal l-value. As is, the declaration just declares a function named myFuncPtr. This declaration fixes that problem:
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int (*myFuncPtr)( int );
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Next, main() doesn t take a single int as a parameter. Besides that, calling main() yourself is a questionable practice. Finally, to call the function pointed to by myFuncPtr, use either myFuncPtr(); or (*myFuncPtr)();, instead of *myFuncPtr();. f. strcmp() returns 0 if the strings are equal. The if would fail if the strings were the same. The message passed to printf() is wrong. Finally, we should be calling strncmp() instead of strcmp(). g. The parameters passed to strcpy() should be reversed. And we should be calling strncpy() instead of strcpy(). h. No memory was allocated for s. When strcpy() copies the string, it will be writing over unintended memory. Once again, we should be calling strncpy(). i. Tons of people, including battle-scarred veterans, run into this problem. The function call in the loop is not actually a function call. Instead, the address of the function DoSomeStuff is evaluated. Because this address is not assigned to anything or used in any other way, the result of the evaluation is discarded. The expression DoSomeStuff; is effectively a no-op, making the entire loop a no-op.
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APPENDIX: Answers to Exercises
In addition, note that the parameter list in main() is missing its usual argc and argv. Instead, it uses void, indicating that it has no parameters. This is actually quite legal. It tells the universe that you have no intention of ever taking advantage of argc and argv. 2. Look in the folder 11.05 - treePrinter.
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