Chapter 8.5, Problem 3E

a.

Program Plan Intro

Program Plan:

• Include library files for various operations.
• Declare object ofofstream.
• Create a statement to open the given file “polar.dat”.
• Use if statement with fail() method to check that the entered file name is available or not.
• Read data from the program and write data to the file.
• int main() function is used to perform all the task.
• Display the calculated results to the user.

Program Description: The main purpose of this program is to create the “polar.dat” file and tostore the given data in the file.

b.

Program Plan Intro

Program Plan:

• Include library files for various operations.
• Declare an object ofofstream.
• Create a statement to open the given file “polar.dat”.
• Use if statement with fail() method to check that the entered file name is available or not.
• Display message to the user to enter the input.
• Read data from the user and write data to the file.
• int main() function is used to perform all the task.
• Display the calculated results to the user.

Program Description: The main purpose of this program is to modify the program code given in part (a), so that the program can accept input from user and append the accepted data into the “polar.dat” file.

c.

Program Plan Intro

Program Plan:

• Include library files for various operations.
• Declare twoobjects forofstream and ifstream.
• Create two open statementsfor “polar.dat” and “xycord.dat” file.
• Use if statement with fail() method to check that the entered file name is available or not.
• Use while loop to read the file.
• Calculate x and y coordinate, by using the below given formula:

  $\begin{array}{l}x=r\left(\cos \theta \right)\\ y=r\left(\sin \theta \right)\end{array}$

• int main() function is used to perform all the task.
• Close both the files.

Program Description: The main purpose of this program is to modify the program code given in part (a), so that the program can calculate x and y coordinate and store the calculated data in the “xycord.dat” file.