Question

Question 2 (a) Provide a single line of C++ code that will declare a variable that points to a string value, the variable is named x. [2 marks] (b) You have array c declared as string *c [5]; Give the single line of C+ + code that will assign the string pointer stored in variable x (from above) to the third element of the array c. [2 marks] (c) Write a for loop that initialises the contents of each element of the array c to the NULL pointer. [3 marks] (d) You have the following declarations at the start of a function: int i,j; int *nums [3]; int *x; Briefly explain what will happen if the function attempts to execute the state ment: nums [-1] -&j; [3 marks] (e) Are the contents of a pointer checked at compile-time or run-time? Briefly [2 marks] explain your answer.

Answer 1

$\color{red}\underline{a:}$

string *x;

$\color{red}\underline{b:}$

c[2] = x;

$\color{red}\underline{c:}$

for(int i = 0; i < 5; ++i) 
    c[i] = NULL;

$\color{red}\underline{d:}$

-1 is not a valid index.
so, nums[-1] will give an error.

$\color{red}\underline{e:}$

pointer variable contains address of a location in main memory.
so, it contents of the pointer can only be checked at the run-time.