Exercise 9.1:Introduction to Pointer Variables

Exercise 9.1:Introduction to Pointer Variables

Here is the problem specification:

Complete this program by filling in the code. Note: use only pointer variables when instructed to by the comments. This program is to test your knowledge of pointer variables and the & and * symbols.

 

 

// This program demonstrates the use of pointer variables
// It finds the area of a rectangle given length and width
// It prints the length and width in ascending order

// PLACE YOUR NAME HERE

#include 
using namespace std;

int main()
{

	int length;	// holds length
	int width;	// holds width
	int area;	// holds area

	int *lengthPtr = nullptr;	// int pointer which will be set to point to length
	int *widthPtr = nullptr;	// int pointer which will be set to point to width

	cout << "Please input the length of the rectangle" << endl;
	cin >> length;

	cout << "Please input the width of the rectangle" << endl;
	cin >> width;

	// Fill in code to make lengthPtr point to length (hold its address)

	// Fill in code to make widthPtr point to width (hold its address)

	area =	// Fill in code to find the area by using only the pointer variables

	cout << "The area is " << area << endl;

	if (// Fill in the condition length > width by using only the pointer variables)
		cout << "The length is greater than the width" << endl;

	else if (// Fill in the condition of width > length by using only the pointer variables)
		cout << "The width is greater than the length" << endl;

	else
		cout << "The width and length are the same" << endl;

	return 0;
}

Sample run:

Please input the length of the rectangle
10
Please input the width of the rectangle
15
The area is 150
The width is greater than the length

 

#include <iostream>
using namespace std;
int main()
{
    int length; // holds length
int width; // holds width
int area; // holds area
int *lengthPtr = nullptr; // int pointer which will be set to point to 
length
int *widthPtr = nullptr; // int pointer which will be set to point to 
width
cout << "Please input the length of the rectangle" << endl;
cin >> length;
cout << "Please input the width of the rectangle" << endl;
cin >> width;
lengthPtr = &length;
widthPtr = &width;
area = *lengthPtr * *widthPtr;
cout << "The area is " << area << endl;
if (*lengthPtr > *widthPtr)
cout << "The length is greater than the width" << endl;
else if (*widthPtr > *lengthPtr)
cout << "The width is greater than the length" << endl;
else
cout << "The width and length are the same" << endl;
    return 0;
}