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CSC 253

CSC 253. Lecture 9. malloc and calloc. Let’s take Jason’s ptr4.c and change it to allocate regions larger than 1 word to incorporate a printing function like we wrote last week to allocate something other than int s. Let’s print the start address and ending address of each array.

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CSC 253

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  1. CSC 253 Lecture 9

  2. malloc and calloc • Let’s take Jason’s ptr4.c and change it • to allocate regions larger than 1 word • to incorporate a printing function like we wrote last week • to allocate something other than ints. • Let’s print the start address and ending address of each array.

  3. Why malloc is dangerous … • If our array gets out of bounds, we can overwrite an element of another array. • How can we calculate the subscript of one array that will smash the zeroth element of the next array?

  4. Binary file I/O • Let’s try the program for writing a file, ptr6.c. • Let’s try the program for reading a file, ptr5.c. • Let’s try to put the output in a more general format, like a memory dump.

  5. File manipulation • Let’s write a program that determines the length of a binary file. • Let’s change the program to set the position to somewhere else in the file. • Let’s change the program to set the position to an arbitrary place in the file, and then report how far it is from the end.

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