Programming Forums > Application Development > C++

TCStyle · Aug 17th, 2006, 2:37 PM

Thanks! I used Narues / voids function and it works! I ran into another problem though. I want to read all the information in each file and then print it on its own line. Heres the script:

(Toggle Plain Text)

        myString = IntToString(x);
        File.open((myString + ".txt").c_str());
	if(File.is_open()) {
		string data;
		File>>data;
		cout << data;
		File.close();
	}

It is nested inside the for() loops so it should repeat it for all 5 files but it only reads content from the first!

Jimbo · Aug 17th, 2006, 3:04 PM

Each time you open the file, you start reading from the beginning. Open it before the loop, and close it after the loop. You might also research the getline function if you want to read an entire line at a time.

TCStyle · Aug 17th, 2006, 3:13 PM

I can't open it before the loop becuase it's reading from 5 different files and each needs to be opened.

Jimbo · Aug 17th, 2006, 3:17 PM

oh, right, forgot that :o

are you incrementing x in your loop? maybe posting an extra couple lines of code on either end would help

DaWei · Aug 17th, 2006, 3:24 PM

(Toggle Plain Text)

Outer loop that determines file name
   Open file
   Inner loop that reads lines
      Read line
      If end of file, leave inner loop
   End inner loop
   Close file
End outer loop

Don't use a high-heel shoe to drive a nail and don't use the extraction operator to read an entire line. The stream has a getline method and the string class has a getline method. Read your documentation and choose the right tool.

Aug 17th, 2006, 2:37 PM	#11
TCStyle Programmer Join Date: Jan 2005 Location: Albany, NY Posts: 43 Rep Power: 0	Thanks! I used Narues / voids function and it works! I ran into another problem though. I want to read all the information in each file and then print it on its own line. Heres the script: (Toggle Plain Text) myString = IntToString(x); File.open((myString + ".txt").c_str()); if(File.is_open()) { string data; File>>data; cout << data; File.close(); } myString = IntToString(x); File.open((myString + ".txt").c_str()); if(File.is_open()) { string data; File>>data; cout << data; File.close(); } It is nested inside the for() loops so it should repeat it for all 5 files but it only reads content from the first! __________________ meh...

Aug 17th, 2006, 3:13 PM	#13
TCStyle Programmer Join Date: Jan 2005 Location: Albany, NY Posts: 43 Rep Power: 0	I can't open it before the loop becuase it's reading from 5 different files and each needs to be opened. __________________ meh...

Aug 17th, 2006, 3:24 PM	#15
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	(Toggle Plain Text) Outer loop that determines file name Open file Inner loop that reads lines Read line If end of file, leave inner loop End inner loop Close file End outer loop Outer loop that determines file name Open file Inner loop that reads lines Read line If end of file, leave inner loop End inner loop Close file End outer loop Don't use a high-heel shoe to drive a nail and don't use the extraction operator to read an entire line. The stream has a getline method and the string class has a getline method. Read your documentation and choose the right tool. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

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Aug 17th, 2006, 3:04 PM	#12
Jimbo Battle Programmer Join Date: Feb 2006 Location: Bellevue, WA, USA Posts: 751 Rep Power: 3	Each time you open the file, you start reading from the beginning. Open it before the loop, and close it after the loop. You might also research the getline function if you want to read an entire line at a time.

Aug 17th, 2006, 3:17 PM	#14
Jimbo Battle Programmer Join Date: Feb 2006 Location: Bellevue, WA, USA Posts: 751 Rep Power: 3	oh, right, forgot that :o are you incrementing x in your loop? maybe posting an extra couple lines of code on either end would help

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Programming Forums > Application Development > C++

Combinding variables...