Pointers

Question 1

What is a pointer?

Answer 1

This is essentially where the variable register address is passed to a variable.

Question 2

How is a pointer done?

Answer 2

We give the variable the * character and assign it the address of another variable by equating it.
e.g.
int *pointer = variable;

Question 3

When calling a pointer what are the two things we can get from it?

Answer 3

Variable address = pointer;

Variable value = *pointer;

Question 4

What is dangling?

Answer 4

This is when a pointer is not initialised with a location.

Question 5

What location does a dangling pointer point to?

Answer 5

A random address

Question 6

how can you prevent a dangling pointer?

Answer 6

By assigning it to nullptr

Question 7

What is pass-by-value?

Answer 7

This is where in a function you pass the value of a variable into another function. When that function changes the value of that variable, it changes it only within that function not globally

Question 8

What is pass-by-reference

Answer 8

This is where in a function youu pass a variable by reference into another function. When that function changes the value of theat variable, it changes it globally.

Question 9

How can pointers be used to locate variables in an array?

Answer 9

If you know the address of an array then you can add a number to that address to find the elemnts within that array

Question 10

Show how a pointer can be used to locate the 5th variable in an array?

Answer 10

int array[6] = {a,b,c,d,e,f};

int element_5 = *(array + 5);

Question 11

How do we pass an array into another function?

Answer 11

void function(int array[]) {
};