Chapter 9, Problem 9.1P

To determine

To modify:

The script “fileex” to sum the numbers from the file and create a file in this format first.

Answer to Problem 9.1P

Solution:

The script is saved and executed as follows.

Explanation of Solution

MATLAB Code:

fid = fopen('subjexp.dat');

%Define the instruction to read information from "subjexp.dat" and open them.

if fid == -1

disp('Unsuccessful; The file is not opened')

%Define the instruction to display the unsuccessful result.

else

SUM = 0;

while ~feof(fid)

Number = strtok(fgetl(fid));

SUM = SUM + str2double(Number);

%Define the instruction to separate each line into the number code and %converts to a number before printing.

end

closeresult = fclose(fid);

%Define the instruction to check the file close for success.

if closeresult == 0

disp('successful: File is closed')

else

disp('Unsuccessful: File does not close')

%Define the if-else statement to check the condition for closing the

%file, and display the relative statement.

end

end

fprintf('The total sum of the numbers is: %.2f\n', SUM)

%Define the instruction to create the total sum of the numbers.

Save the MATLAB script with name, chapter_9_54793_9_1P.m in the current folder. Execute the script by typing the string name at the command window to modify the script “fileex” to sum the numbers from the file and create a file in this format first.

Result:

Therefore, the script is saved and executed.