C++ Pointer Lab

Exercise 1: Declare 2 int variables x and y and 2 int* pointer variables p and q.  Set x to 2, y to 8, p to the address of x, and q to the address of y.  Then print the following information:

Exercise 2: Declare 3 int variables x, y, z and 3 int* pointer variables p, q, r.  Set x, y, z to three distinct values.  Set p, q, r to the addresses of x, y, z respectively.

/*

// Author:Zachary //

//                                                                               //

// Date:                    11/10/14 23:34                        //

//                                                                             //

// Input:  None                                                       //

 */

#include<iostream>

#include <algorithm>    // std::swap

using namespace std;

void Exone ()

//Exercise 1: Declare 2 int variables x and y and 2 int* pointer variables p and q.//

//Set x to 2, y to 8, p to the address //

//of x, and q to the address of y.  Then print the following information://

{

    int x,y;

int *p,*q;

    x=2;

y=8;

p=&x;

q=&y;

cout<<"--------------------Exercise 1:------------------"<<endl;

cout<<"-------------------------------------------------"<<endl;

cout<<" "<<endl;

cout<<" "<<endl;

cout<<"The address of x is "<<&x<<" and the value of x is "<<x<<endl;//(1) The address of x and the value of x.

cout<<"The value of p is "<<p<<" and the value of *p is "<<*p<<endl;//(2) The value of p and the value of *p.

cout<<"The address of y is "<<&y<<" and the value of y is "<<y<<endl;//(3) The address of y and the value of y.

cout<<"The value of q is "<<q<<" and the value of *q "<<*q<<endl;//(4) The value of q and the value of *q.

cout<<"The address of p (not its contents!) is "<<&p<<endl;//(5) The address of p (not its contents!).

cout<<"The address of q (not its contents!) is "<<&q<<endl;//(6) The address of q (not its contents!).

}

void Extwo()

//Exercise 2: Declare 3 int variables x, y, z and 3 int* pointer variables p, q, r.  //

//Set x, y, z to three distinct values.  Set p, q, r to the addresses of x, y, z respectively.//

{

    {

        int x,y,z;

        int *p,*q,*r;

        x=1;

        y=2;

        z=3;

        p=&x;

        q=&y;

        r=&z;

        cout<<" "<<endl;

        cout<<" "<<endl;

        cout<<" "<<endl;

        cout<<" "<<endl;

        cout<<" "<<endl;

        cout<<" "<<endl;

        cout<<"--------------------Exercise 2:------------------"<<endl;

        cout<<"-------------------------------------------------"<<endl;

        cout<<" "<<endl;

        cout<<" "<<endl;

        //(1) Print with labels the values of x, y, z, p, q, r, *p, *q, *r.

        cout<<"value of x is "<<x<<endl;

        cout<<"value of y is "<<y<<endl;

        cout<<"value of z is "<<z<<endl;

        cout<<"value of p is "<<p<<endl;

        cout<<"value of q is "<<q<<endl;

        cout<<"value of r is "<<r<<endl;

        cout<<"value of *p is "<<*p<<endl;

        cout<<"value of *q is "<<*q<<endl;

        cout<<"value of *r is "<<*r<<endl;

        cout<<" "<<endl;

        cout<<" "<<endl;

        //(2) Print the message: Swapping values.

        cout<<"!!!!!!!SWAPPING VALUES!!!!!!"<<endl;

        cout<<" "<<endl;

        cout<<" "<<endl;

        //(3) Execute the swap code: z = x; x = y; y = z;

      std::swap(z,x);

      std::swap(x,y);

      std::swap(y,z);

      //(4) Print with labels the values of x, y, z, p, q, r, *p, *q, *r.

        cout<<"value of x is "<<x<<endl;

        cout<<"value of y is "<<y<<endl;

        cout<<"value of z is "<<z<<endl;

        cout<<"value of p is "<<p<<endl;

        cout<<"value of q is "<<q<<endl;

        cout<<"value of r is "<<r<<endl;

        cout<<"value of *p is "<<*p<<endl;

        cout<<"value of *q is "<<*q<<endl;

        cout<<"value of *r is "<<*r<<endl;

    }

}

int main()

{

Exone();

Extwo();

  return 0;

}//end main

Four by Four Array

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <ctime>
using namespace std;

int main()
{
const int ROW = 4;
const int COL = 4;
unsigned seed = time(0);
srand(seed);
int FourbyFour[ROW][COL] = {{1 + rand() % 10, 1 + rand() % 10, 1 + rand() % 10, 1 + rand() % 10},
{1 + rand() % 10, 1 + rand() % 10, 1 + rand() % 10, 1 + rand() % 10},
{1 + rand() % 10, 1 + rand() % 10, 1 + rand() % 10, 1 + rand() % 10},
{1 + rand() % 10, 1 + rand() % 10, 1 + rand() % 10, 1 + rand() % 10}};
int sum;
cout << endl;

for (int x = 0; x < ROW; x++)
{
for (int y = 0; y < COL; y++)
{
cout << "  " << setw(2) << FourbyFour[x][y] << "  ";
}

cout << endl;
}

sum = (FourbyFour[0][0] + FourbyFour[1][1] + FourbyFour[2][2] + FourbyFour[3][3]);

cout << endl;
cout << "Diagonally, the sum of the numbers is  " << sum << "." << endl;
cout << endl;

return 0;
}