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, , prepend it with sign. For example, &val returns the memory address of .

This memory address is assigned to a pointer and can be shared among functions. For example, assigns the memory address of to pointer . To access the content of the memory pointed to, prepend the variable name with a *. For example, *p will return the value stored in and any modification to it will be performed on .

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

Returns

• The function is declared with a void return type, so there is no value to return. Modify the values in memory so that contains their sum and contains their absoluted difference.