New PDF release: Advanced Turbo C Programming

By Keith Weiskamp

ISBN-10: 0127426892

ISBN-13: 9780127426891

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C: cpptest. c 5 : main ( ) cpptest. c 6 : { cpptest. c 7 : int i, j ; cpptest. c 8 : cpptest. c 9 : printf ("\nNumber comparison program") ; cpptest. c 17: if ( (i >= 100) I I ( j >= 100) ) cpptest. c 20: printf ("\nThe smallest number is %d", ( (i) < (j) ) ? c 21: printf ("\nThe largest number is %d", ( (i) > (j) ) ? (i) : (j)); cpptest. c 22 : cpptest. c 26: printf ("\nBoth numbers are less than %d", 200) ; cpptest. c 28: } Note now that some of the code has been omitted, such as the statements printf ("\nMax value out of range—exiting program") ; exit(l); This is due to the fact that the condition ttifMAXVAL > 100, encountered at the time the file was preprocessed, was not true.

Keep in mind, however, that environ should be used as a read-only variable. If you want to change the settings of one of the environment variables, you should use the function putenv which is supplied by Turbo C. The _psp variable allows you to inspect the program segment prefix (PSP) that is created by DOS. h as extern unsigned int _psp The value stored is this variable is actually the segment address of where the PSP is located. The PSP contains the information that DOS needs in order to load and execute a program.

56 2 · Turbo C Programming Techniques Let's look at an example. Assume we need to read in a string from the user. Of course, in order to store the string, we must first allocate memory for it. We can declare a buffer statically as char buf [30] ; or we can allocate the memory dynamically with buf = malloc(30); In the first case, memory is allocated in the data section of a program, and in the second case, memory is allocated from the heap. Now, if we attempt to read in a string using one of the input functions such as gets gets (buf) ; and the user types in a string which is larger than the allocated memory space such as "This string contains more characters than allocated memory" the string will be stored in the allocated memory space; however, since the string is larger, it will extend the range of the allocated memory.

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Advanced Turbo C Programming by Keith Weiskamp

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