[SQL] ASCII Art - Sorting an array of ASCII characters by brightness levels (C/C++)

I am working on a program (in C/C++) where the user should take a user selected image and convert this into ASCII art (using SQL). So far I have been able for the user to select an image and display this image in greyscale in a window.

However, I am currently having difficulties sorting the ASCII characters as an array of brightness levels and then matching the single character to a pixel area.

I am aware that I will need to use 'for' loops, but I can't find anything that useful on the internet so far. Thank you

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