Thread: How to read from a file and find mean o in C++ which has integers and characters?

I have a txt file called test.txt which contains:

ID NUMBER NAME EXAM1 EXAM2 EXAM3
040140101 Furkan Cingi 89 85 79
040140102 Faruk Yilmaz 70 70 50
040140103 Fatma Yildiz 65 20 3
040140104 Burak Yilmaz 10 11 12
040140105 Burkina Sarz 8 88 100
040140106 Bame Mert 18 28 59
040140107 Barnie Esry 56 20 6
040140108 Farnie Zarni 80 40 85
040140109 Neden Eser 78 45 10
040140110 Son Eser 14 58 45

How can I get each exam grades and compute mean and then write into result.txt file ?

I used structure for this but can't read only exam grades.

I think we should use struct. But I don't know how to use struct to find grades. I am new

Phase 1 - File I/O

Step 1: Write a simple program that reads one line of the text file at a time, and prints that line to the screen. When you have that working, proceed to the next step.

Step 2: Modify the program so that, after reading a line, you extract each field into its own variable. Then print each variable to the screen.

If you cannot get this far on your own, refer to your learning material (if you don't have a good book, get one) and practice with the examples until you can figure it out. If you get stuck, show us what you have so far so we can help you.

If you do get this far on your own, proceed to Phase 2.

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Phase 2 - Using Structs

Step 1: Start with the basics - define a struct, create a single variable of that type, assign values to each member, and print each member to the screen. If you cannot do this, then you need to refer to your learning material. Work through some of the examples until you get the basic idea, then try to do this first step on your own.

Step 2: Modify the code so that instead of hard-coding the member assignments, you read input from stdin, assign the input to each member, and print each member to the screen.

Step 3: Modify the code so you read into an array of struct (instead of just one) and print each member of each array element to the screen. This will need surprisingly little modification to achieve.

If you get stuck anywhere along the way, post your progress and tell us where you're stuck.

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Phase 3 - Putting it together

Create your array of struct as per Phase 2, and instead of reading input from stdin, read it from the file as per Phase 1. Print the output to ensure you're reading and parsing the input correctly.

After this, implement any calculations you need. The final step would be modifying the code to write the necessary results to an output file.

The key here is baby-steps: A development process