How to display ASCII data on screen in readable format

i made the c program to open and read the data and take the data into buffer,All data is ASCII character code without checksumand i want to display data on screen in readable format,how can i do that is there any in built function to convert ASCII data.
I don't follow. Windows is capable of printing ASCII characters. Maybe if you show us what the data looks like and how you want it to look like then we can do better.
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