Consider the following C-code:

int a; int *aPtr;

a = 9;

aPtr = &a;

printf(a is equal to %d ,a);

printf(the address of a is: %p , &a);

printf(Using the pointer, a is equal to %d , *aPtr);

printf(Using the pointer, the address of a is: %p , aPtr);

return 0;

Adding functions to the above to calculate a*a and return the value: one function doing call-by- value and the other function doing call by reference