Addresses, Pointers, and Function calls 1. Explain the difference between pass-by-value, pass-by-reference, and pass-by-pointer in your own words. 2. Read the documentation on the sizeof operator here. Write a small program that creates the following pointers: int,float*,std::string*. In your program, use the sizeof operator to calculate and print the size of each of the different pointer types. Write down what you observe about the results. 3. Examine the following code: #include using namespace std; void swap(float* a, float** b) float* temp a; a b b-temp; int main) float a1.234 float b-4.321 float pa &a; float pb &b swap (&pa, &pb) Explain what is happening in this code. What are the final values of a, b, pa, and pb? HINT: You don't need to give exact values for pa and pb, just explain which data they are pointing to