Write a C program to swap content of memory blocks of size 32 bytes

by

It’s similar to the way you can use a temporary variable to swap two integers:

int t = a;   // temporarily save a
a = b;       // overwrite a with b
b = t;       // overwrite b with saved a

In this case, you can create a temporary buffer of size 32 bytes with the following declaration:

char tempbuff[32];

and then use that to swap the contents of the two other 32-byte buffers, keeping in mind that memcpy can copy arbitrary chunks of memory, as with:

memcpy (tempbuff, firstbuff, 32); // copy firstbuff to tempbuff

That, combined with the earlier int t = a; a = b; b = t; method, should be more than enough to get you writing a complete program to do the job you need.

More Related Contents:

  1. (Function) Swaping two numbers in c
  2. How dangerous is it to access an array out of bounds?
  3. How are multi-dimensional arrays formatted in memory?
  4. convert big endian to little endian in C [without using provided func] [closed]
  5. How is malloc() implemented internally? [duplicate]
  6. Will a `char` always-always-always have 8 bits?
  7. Sharing memory between two processes (C, Windows)
  8. In C, do braces act as a stack frame?
  9. What is the difference between a segmentation fault and a stack overflow?
  10. Should I free char* initialized using string-literals?
  11. how to print memory bits in c
  12. What is a contiguous memory block?
  13. L1 memory bandwidth: 50% drop in efficiency using addresses which differ by 4096+64 bytes
  14. How to handle realloc when it fails due to memory?
  15. Can I rely on malloc returning NULL?
  16. Using Dynamic Memory allocation for arrays
  17. If free() knows the length of my array, why can’t I ask for it in my own code?
  18. How are variable names stored in memory in C?
  19. How garbage values are assigned to variables in c
  20. When should I use malloc in C and when don’t I?
  21. Why does “memset(arr, -1, sizeof(arr)/sizeof(int))” not clear an integer array to -1?
  22. Force free() to return malloc memory back to OS
  23. C: pointer to array of pointers to structures (allocation/deallocation issues)
  24. dynamic allocation/deallocation of 2D & 3D arrays
  25. Why exactly should I not call free() on variables not allocated by malloc()?
  26. Reading Other Process’ Memory in OS X?
  27. C Memory Management
  28. How many chars can be in a char array?
  29. Where do malloc() and free() store allocated sizes and addresses?
  30. How to check heap size for a process on Linux

Leave a Comment