2. Fun() { int *ptr = NULL; load_ptr(&ptr); } Load_ptr(int **ptr) { *ptr = malloc(1024); } This example where double pointer is useful, if don't use double pointer then it would be difficult to assign memory to ptr in load_ptr.

Find the Kth max value in constant array. The array is very big so if we create a separate array for sorting then it would take lot of memory. This answer we have to min max heaps.

Using random() in C generate random numbers between a given range say[a,b]: (a + (random()*(b-a))) is the answer

Find the equlibrium point in array eg: arr[5] = {1,3,8,2,2} if we see index 2 which has 8 is equilibrium point since 4 and 4 on either side, so we need to return index i.e 2 if no equlibrium point then return -1.

You have created a module and you have fixed all memory leaks using valgrind, but in production this module is generating out of memory error. This answer is we are malloc ing small small values and freeing this is creating memory fragmentation due to which memory allocation to get contiguous memory is failing.

Explain page fault, virtual memory and who handle page faults.