2. Passing parameters to a function by reference: Write the function swap we did in class and test it in a main program Show that the function parameters should be passed by reference. Use pointers to pass the parameters by reference. 3. Pointers and Arrays: Rewrite the following program to use pointers instead of arrays in two ways: (1) Use pointer operators that do not modify the pointer to process the array. You can either use the array name as the pointer, or you can define a constant pointer and make it point to the array (i.e. array's first element). (2) Use pointer operators that modify the pointer to process the array. You should first define a non-constant pointer and make it point to the array. int main(void) { int salary(20); for (i=0;i>salary[1]; } for (i=0;i