A pointer in C++ is used to share a memory address among different contexts (primarily functions). They are used whenever a function needs to modify the content of a variable, but it does not have ownership. In order to access the memory address of a variable, val, prepend it with & sign. For example, &val returns the memory address of val. This memory address is assigned to a pointer and can be shared among functions. For example, int* p = &val assigns the memory address of val to pointer p. To access the content of the memory pointed to, prepend the variable name with a *. For example, *p will return the value stored in val and any modification to it will be performed on val. void increment(int *v) { (*v) ++; } int main() { int a; scanf("%d", &a); increment(&a); printf("%d", a); return 0; } Function Description Complete the update function in the editor below. update has the following parameters: int *a: an integer int *b: an integer A pointer in C++ is used to share a memory address among different contexts (primarily functions). They are used whenever a function needs to modify the content of a variable, but it does not have ownership. In order to access the memory address of a variable, val, prepend it with & sign. For example, &val returns the memory address of val. This memory address is assigned to a pointer and can be shared among functions. For example, int* p = &val assigns the memory address of val to pointer p. To access the content of the memory pointed to, prepend the variable name with a *. For example, *p will return the value stored in val and any modification to it will be performed on val. void increment(int *v) { (*v) ++; } int main() { int a; scanf("%d", &a); increment(&a); printf("%d", a); return 0; } Function Description Complete the update function in the editor below. update has the following parameters: int *a: an integer int *b: an integer