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3. We've seen variable types that store characters, integers and floating point numbers. In a very similar fashion, addresses can be are stored. A variable that stores an address value is called a pointer variable, or simply a pointer. Let's take a look at the following example. As you may have noticed, we did not directly assign anything to num, c, count, and salary. Instead, we used the pointers to assign values to where those pointers were pointing. What does this program do? Can you make changes to assign anything to num, c, count, and salary and print them using pointers numptr, cptr, countptr, and salaryptr. #include using namespace std; int main() int char c; int num; count; float salary; // Declaring bunch of pointers that point to nothing (point to null) int char *cptr; I/ declare a pointer variable to an integer I1 declare a pointer varíable to a character I1 declare a pointer variable to an integer *numptr; int float *countptr; *salaryptr; // declare a pointer variable to a float I/ Making then point somewhere numptr - # //numptr is pointing to num cptr - &c; /cptr is pointing to e countptr - &count; /countptr is pointing to count salaryptr - ksalary; //salaryptr is pointing to salary i1 Assign values to the locations where the pointers point "numptr = 2; *cptr - 'A'; *countptr - 100; *salaryptr = 3200; I/ Display the contents of those memory locations cout < num « endl; cout « c « endl; cout « count « endl; cout « salary « endl; return e;

3. We've seen variable types that store characters, integers and floating point numbers. In a very similar fashion, addresses can be are stored. A variable that stores an address value is called a pointer variable, or simply a pointer. Let's take a look at the following example. As you may have noticed, we did not directly assign anything to num, c, count, and salary. Instead, we used the pointers to assign values to where those pointers were pointing. What does this program do? Can you make changes to assign anything to num, c, count, and salary and print them using pointers numptr, cptr, countptr, and salaryptr. #include using namespace std; int main() int char c; int num; count; float salary; // Declaring bunch of pointers that point to nothing (point to null) int char *cptr; I/ declare a pointer variable to an integer I1 declare a pointer varíable to a character I1 declare a pointer variable to an integer *numptr; int float *countptr; *salaryptr; // declare a pointer variable to a float I/ Making then point somewhere numptr - # //numptr is pointing to num cptr - &c; /cptr is pointing to e countptr - &count; /countptr is pointing to count salaryptr - ksalary; //salaryptr is pointing to salary i1 Assign values to the locations where the pointers point "numptr = 2; *cptr - 'A'; *countptr - 100; *salaryptr = 3200; I/ Display the contents of those memory locations cout < num « endl; cout « c « endl; cout « count « endl; cout « salary « endl; return e;

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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3. We've seen variable types that store characters, integers and floating point numbers. In a very similar fashion, addresses can be are stored. A variable that stores an address value is called a pointer variable, or simply a pointer. Let's take a look at the following example. As you may have noticed, we did not directly assign anything to num, c, count, and salary. Instead, we used the pointers to assign values to where those pointers were pointing. What does this program do? Can you make changes to assign anything to num, c, count, and salary and print them using pointers numptr, cptr, countptr, and salaryptr. #include <iostream> using namespace std; int main() int char c; int num; count; float salary; // Declaring bunch of pointers that point to nothing (point to null) // declare a pointer variable to an integer // declare a pointer variable to a character // declare a pointer variable to an integer *salaryptr; // declare a pointer variable to a float // Making them point somewhere int *numptr; char *cptr; *countptr; int float numptr - &num; //numptr is pointing to num cptr - &c; //cptr is pointing to c countptr - &count; //countptr is pointing to count salaryptr - &salary; //salaryptr is pointing to salary il Assign values to the locations where the pointers point *numptr = 2; *cptr - 'A'; *countptr - 100; *salaryptr = 3200; // Display the contents of those memory locations cout < num « endl; cout <« c « endl; cout « count « endl; cout « salary « endl; return 0;
Transcribed Image Text:3. We've seen variable types that store characters, integers and floating point numbers. In a very similar fashion, addresses can be are stored. A variable that stores an address value is called a pointer variable, or simply a pointer. Let's take a look at the following example. As you may have noticed, we did not directly assign anything to num, c, count, and salary. Instead, we used the pointers to assign values to where those pointers were pointing. What does this program do? Can you make changes to assign anything to num, c, count, and salary and print them using pointers numptr, cptr, countptr, and salaryptr. #include <iostream> using namespace std; int main() int char c; int num; count; float salary; // Declaring bunch of pointers that point to nothing (point to null) // declare a pointer variable to an integer // declare a pointer variable to a character // declare a pointer variable to an integer *salaryptr; // declare a pointer variable to a float // Making them point somewhere int *numptr; char *cptr; *countptr; int float numptr - &num; //numptr is pointing to num cptr - &c; //cptr is pointing to c countptr - &count; //countptr is pointing to count salaryptr - &salary; //salaryptr is pointing to salary il Assign values to the locations where the pointers point *numptr = 2; *cptr - 'A'; *countptr - 100; *salaryptr = 3200; // Display the contents of those memory locations cout < num « endl; cout <« c « endl; cout « count « endl; cout « salary « endl; return 0;
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