I want to find the definition from the library that the result corresponds to

I have a library in excel format. A.xlsx

I am working on a code that finds out which letter corresponds to the number I found as a result of the calculations I have made and writes it to the screen. For example, I calculated 50+30. Result=80. Code should examine the library and write on the screen that 80 is C. Can you help with this?

Answer 1

[Walter Roberson]

For the question you asked:

Use ismember() to search for an exact match.

For the question that you did not ask:

sum(score<=key) to find the index.

Watch out for scores less than the minimum or greater the maximum.