Possible to make Chart With Modified X-axis

The bin's are for your counting - another array, of stings, could be made for your labels.

Consider this - if you do this correctly, you can create the number of bins = number points you wish to plot. Should your data range then change, the bin-sizes could change along with it (this is an possible if you create all dynamically).

You could be very clever about assigning bins - the index could, for example, be the result of division by 10, cast as an int. This means you don't even need a switch or other conditional. Simply do something like:

for(...)
bin[yourVal/10]++;

Rule 1: Make the computer do the work.