reading a float from file

**jamie** · 02-26-2003

I'm having a problem reading float data type from file. The file is structured so that sets of float values would be separated by -99. (ie. 5.43, 6.78, 4.35, -99, 4.32, etc...). The -99 would flag the beginning of the next set. When I initially wrote the program, integers were saved to the file, and reading them back in were no problem. But then I modified the code to read and write floats, and it doesn't read them anymore. I've tried a couple of different ways:

Code:

   data >> temp; //data is file, temp is var
   data.getline (temp, sizeof(temp))

but both methods skip all the floats and only read in the -99. temp is declared as float. Why is this happening? How can I read in the float values? I've checked around, but can't find a specific answer to this. Any help would be greatly appreciated.

**nextus** · 02-26-2003

maybe your temp variable is an integer..it worked fine for me..my text file looked like this

Code:

99 5.43 6.78 4.35

and here is the code

Code:

#include <iostream.h>
#include <fstream.h>


int main()
{
	ifstream a_file("date.txt", ios::nocreate);
	float var = 0.0f;

	while(a_file.eof() == false)
	{
		a_file >> var; //should skip white spaces and store number;
		cout << var << endl;
	}

	return 0;
}

hope that helps

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