[Giorgio33]

Thanks my friend, but I have a[200][2].
a[4][2] is only for test.

[JaKWaC]

What does that have to do with anything? Change arr[7][2] to arr[200][2], it all works the same. Hell I could make it dynamic and expand till the end of a file is read in, or ask the user for a number of points to randomly generate.

The loop will still work.

This post has been edited by JaKWaC: 28 March 2011 - 06:11 PM

[Giorgio33]

Thank you JaKWaC. The program is reading the file and calculating the average distance between points.

s +=d;
m=s/((N-1)*N/2);

What can I do to get only the last value? ---> d_média = 3.353

file.in:
2 0
3 0
0 5
2 1
3 1
6 8

m = 0.06667
m = 0.3722
m = 0.4388
m = 0.4388
m = 0.9007

m = 1.167
m = 1.167
m = 1.234
m = 1.728

m = 1.959
m = 2.136
m = 2.482

m = 2.549
m = 2.932

m = 3.353

This post has been edited by Giorgio33: 28 March 2011 - 11:23 PM

[JaKWaC]

You mean calculate the distance between the last two points?

You could take the number of points in your array and do the math for, a[MAX_ELEMENTS-1] and a[MAX_ELEMENTS-2] (where MAX_ELEMENTS is the size of your array, -1 gives you the last elements, -2 gives you the second to last.)

This post has been edited by JaKWaC: 28 March 2011 - 11:27 PM