3i Infotech Placement: Sample Questions 379 - 381 of 1245

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Question 379

Describe in Detail Essay▾

What are the criteria for choosing a process for swapping out of the memory to the swap device?

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Explanation

Swapping Process Out
  • The kernel gathers the page addresses of data at primary memory to be swapped out.
  • Kernel copies the physical memory assigned to a process to the space allocated on the swap device.
  • The mapping between physical memory and swap device is kept in page table entry.

Question 380

Describe in Detail Essay▾

Define namespace?

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Explanation

  • It is a feature in c ++ to minimize name collisions in the global name space.
  • This namespace keyword assigns a distinct name to a library that allows other libraries to use the same identifier names without creating any name collisions.
  • Compiler uses the namespace signature for differentiating the definitions.
Define the How to Use the Namespaces in C ++

Question 381

Describe in Detail Essay▾

  1. main ()
  2. {
  3. static char names[5][20] ={ “pascal” “ada” “cobol” “fortran” “perl” };
  4. int i;
  5. char t;
  6. t =names[3];
  7. names[3] =names[4];
  8. names[4] =t;
  9. for (i =0; i 4; i ++ )
  10. printf ( “%s names[i]);
  11. }
Edit

Explanation

  • In a program ,
Table Shows the Program
static char names [5] [20] = { “pascal” “ada” “cobol” “fortran” “perl” } ;Given the static character 2D array.
int i;Assign integer variable i.
char ⚹ t;Given the character pointer t.
t = names [3] ;Given the t = name [3] ;

So, t = fortran

names [3] = names [4] ;Here name [3] = fortran

so, fortran = names [4] ;

names [4] = t;Here names [4] = fortran

So, fortran = t;

for (i = 0; i ⇐ 4; i ++)

printf ( “% s” names [i] ) ;

Apply for loop

And print names [i]

But, Array names are pointer constant

So, they can՚t be modified

  • So the answer is Compiler error: L value required in function main