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thanks tabstop :P

There's another question(sorry i'm an absolute beginner)

why doesn't abs work in my function?

I have already #include <math.h>

I'm trying to read n lines of numbers with in each of the lines 6 numbers. These numbers(each line) are the coordinates of a triangle like:

4 ->number of triangles(lines)
x1 y1 x2 y2 x3 y3
x1 y1...