Is it necessary to include a return statement after my while loop in this function?

Question

I have a function like

int myfun(int *a, int *b)
{
    while(some condition)
    {
        if(condition) return *a + *b;
        else
        {
            some manipulation;
        }
    }
    return -1;
}

When first return statement in while->if part is encountered,does the control go to the function calling myfun or while loop still continues?Why is the return -1 statement needed?

Answer 1

After the return *a+*b the function returns that and ends. You need the return -1 because if that condition is never met, what will it return? It is a int function so it has to return something.