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Merge pull request #604 from daixtrose/patch-1
add c++ code syntax highlighting
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## Examples
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### Simple - reading from an existing xlsx spread sheet.
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The following C plus plus code will read the values from an xlsx file and print the string values to the screen. This is a very simple example to get you started.
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```
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```c++
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#include <iostream>
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#include <xlnt/xlnt.hpp>
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As you can see the process.cpp file simply walks through the spread sheet values row by row and column by column (A1, B1, C1, A2, B2, C2 and so on).
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### Simple - storing a spread sheet in a 2 dimensional C++ Vector for further processing
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Loading a spread sheet into a Vector provides oppourtunities for you to perform high performance processing. There will be more examples on performing fast look-ups, merging data, performing deduplication and more. For now, let's just learn how to get the spread sheet loaded into memory.
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```
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```c++
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#include <iostream>
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#include <xlnt/xlnt.hpp>
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#include <vector>
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real 0m0.044s
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```
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### Simple - writing values to a new xlsx spread sheet.
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```
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```c++
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#include <iostream>
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#include <xlnt/xlnt.hpp>
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#include <vector>
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