How do i do math problems with files in java?

[Goldenrtvr]

here is the question: Read 3 coordinates of a triangle. Is it isosceles? Is it a right angle triangle? Which is the hypotenuse? i have to put the info into a file, and then use the info to solve a problem. how do i do this?

 

[CodeMonkeyJ]

So, I've already answered the file reading part. Check out the static function Double.valueOf(String) for turning the text into a number. Once you have your three points, it's easily available math that you can Google. I'll help more here if needed, but, for example, for checking if it's a right triangle, you use the Pythagorean theorem on the sides and see if it's true. In this case, you'd first have to figure out your longest side for determining which side C, which is also a trivial equation.

 

[Goldenrtvr]

can you do this with .txt files?

 

[CodeMonkeyJ]

Check out the thread on reading files for how to read a file line by line. Then, store each variable as you read it out. Assuming that they're all on different lines, back to back:

double a = in.readLine();
double b = in.readLine();
double c = in.readLine();