Hi,

The following things must be computed using C++, here goes:

I am about to create a program that takes information from a text file. The text file will contain things such as student number, followed by the different marks that the student received. However there is a number displayed on the first line (4) that says how many assignments were passed in. ex:

4
123456 8 5 6 9
347687 10 10 9 9
132657 8 0 -1 10
273828 10 10 0 5


The first number is the student number, each other number divided by spaces is the marks received.

Notice that there is a -1 in there. This would mean that there is a valid excuse for not handing in an assignment (which is easily put into an if and else statement)

You must already know that the program will have to do this, ex:
(8 + 5 + 6 + 9) / 4 (being the top line number)
and if there is a -1 then -1 from the assignment number, making it 3.

There can be more than one -1, but there has to be at least one mark for each student.

From this there will be a traditional grade of :
95-100 A+ 90-94.9 A 80-89.9 A- 77-79.9 B+ 74-76.9 B 70 73.9 B- 67-69.9 C+ 64-66.9 C 60-63.9 C- 50-59.9 D 0 - 49.9 F

then there should be output to a text file of the scores, something like this:

123456 100 A+ (just an example)
234344 0 F

In a DIFFERENT file there should also be printed: number of students, average of class, and deviation for the class:

stdDev = sqrt ( ((s1-avg)2 + (s2-avg)2 + (s3-avg)2 + ... + (sn-avg)2)/(n+1) )

Of course average has to be figured out before the standard deviation,so I will need to open the input file, read it, close it, then open it again.


My question to all of you is: Could you give me a good way to format this program, and give me some hints and reminders, because I haven't gone this far into coding in C++ before.

You will probably recognize that I'm starting this off slowly, and not coding until I have the floor plan. That's my purpose

Hi tyler,

• Open the file.
• Get the number of lines from the file.
• Then in a loop that varies from 0 to number_of_lines - 1, :
• Get the first line of data using getline function.For example, like this:
  
  CPP / C++ / C Code:

  fin.getline(str, 30);
  

• Scan the string you got for specific format using sscanf.
  For example, you if the string is str, you can scan like this:
  
  CPP / C++ / C Code:

  sscanf(str, "%d %d %d %d %d ", 
                   &id1, &mark1, &mark2, &mark3, &mark4)
  

• Then you can process the marks as you wish and then write back to the file using << operator.
• Finally close all the files

Paramesh.

how would I get the number of lines? I realize it would involve using .get . but that's my limit.

You can use >> operator for that.

For example, like this:
The get is used to get the line break after the number.


Paramesh.

thanks, I'll be fine now.