Thread: C++ text file output...specifics

i attached my cpp file in this post
it is a farely simple application that involves a bunch of little equasions and calculations, except i want it to output d, h, x, and nd into a text file, in that order.
and then i want to be able to read d from the first line and h from the second...in another opengl related cpp that will render a drawing based on those four from the text file.

i have looked at a bunch of online sources but can't get any of the ofstream...stuff to work.

last question: in the cpp file that reads these 4 and renders an opengl drawing i would like to be able to have it refresh as i for example press enter. I have already activated the keyboard and such, lighting, and a pause key for stopping rotation, but how would i set a key to refresh/get updated values from the text file

fine don't answer the above just answer this:
i know how to output the numbers (not characters or strings) onto a text file, 4 lines and therefore 4 numbers/floats.

now how can i read them in another program as floats and set them equal to something i intitialized and set as a float in this program. for example set line 1=x, line 2=y, line 3=z...
pleeeeeese help

To read the values just use ifstream.

double var1,var2,var3,var4;
ifstream input("input.txt");
input >> var1 >> var2 >> var3 >> var4;

that would read in 4 double values from the text file

thank you very much