populating combo-box with calculated range dependant upon other data input

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I have two items which can be selected from two seperate comboboxes. I need to populate a 3rd combobox with range calculated from selection of first two. Default for this 3rd box must be 0 with plus and minus range. A little help would be much appreciated.

Thanks tinstaafl, I get that and have adapted it to solve one problem. My next problem is where I need the result range to be from 0 to a lower end of range then a break (preferably with a 0) before starting again at higher end of range to another calculated high end. As example: 10, 15, 20, 25, ... 0 ... 65, 70, 80 etc. Ranges and increments will all be calculated depending on other input. Is this possible and, if it is, how ?

You should probably mark this one solved and start a new question with some code that might help explain what it is you're trying to do. Keeping the questions to one problem at a time helps people when they are searching for help on similar problems.

Write a C program that should create a 10 element array of random integers (0 to 9). The program should total all of the numbers in the odd positions of the array and compare them with the total of the numbers in the even positions of the array and indicate ...

Hi. so this is actually a continuation from another question of mineHere but i was advised to start a new thread as the original question was already answered.

This is the result of previous question answered :

I have a 2d matrix with dimension (3, n) called A, I want to calculate the normalization and cross product of two arrays (b,z) (see the code please) for each column (for the first column, then the second one and so on).
the function that I created to find the ...