Reading comma-separated data from file
I am just starting with C++ and want to write a small program that reads data from a file and calculated some numbers from it. The second part has been done, but I got stuck with the file reading. Actually, I can read the file, but I don't manage to get the data into matrix variables. The format op the file is:
Can anyone help me with this?
Thanks in advance
Read lines of file into variable line.
Thanks for your help. If I understand this correctly, this command extracts the values that are separated by the colon. These values are extracted from the string 'line'. So how do I get one line from a file in the variable 'line'?
Function to read it:
int i, lines[numlines]; //array
FILE *fileHandle; //file pointer
fileHandle = fopen("filename", "rb"); //open filename as read binary
if (!fileHandle) return 0; //file didn't get opened so return
for (i=0; i < numlines; i++) fscanf(fileHandle, "%d,\n", &lines[i]);
There! Now if you want to access line 1 you would just: line,
or line two: line
I didn't put much error checking into it, and it isn't very dynamic, but you should be able to figure that out (although it sounds like your a new programmer, forgive me if this is an incorect assumtion).
Yes, I am indeed a :newbie: in C++ programming. But you have to start once :) I want to perform some calculations on a file with the following format:
The file is generated on another system by a program that I do not control, so I have to deal with it. By reading some manuals, this is what I could do to open the file and display it (see below). I tried all the suggestions above, but they don' work with this file. I want the values to go into an array. The number before the comma is the number in the array. So A=362, A=323, etc
thanks in advance for all your help.
---> read and display
cout << ch;
--> an option to read a full line and separate values by comma (does not work)
infile.getline(line, 40, endl); /* line ends after 40 characters of 'end of line' */
std::cout << "Number " << line << std::endl;
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