While writing a c program we all deals with the bulk data which may be available on spread sheets like Excel but we can't directly read into the program but we can read a single sheet a workbook with the help of csv format. To do so we have to save the file in csv format from excel. Then read that file in c program using file handling.
The csv file separate the data by commas
but if we have the commas in the data then the field will be
enclosed in the double quotes
like "1,2" .
Again we may also require the double quotes also in the file
so it can also be written as
"1,2"" this will generate the output as 1,2"
Hope u got the basic concept of a csv file
Rest is the basic file handling