CSV spreadsheet files are suitable for storing tabular data in a relatively portable way.

The CSV format is flexible but somewhat ill-defined.

For present purposes, authors may assume that the data fields contain no commas, backslashes, or quotation marks.



Task

Read a CSV file, change some values and save the changes back to a file.

For this task we will use the following CSV file:

C1,C2,C3,C4,C5
1,5,9,13,17
2,6,10,14,18
3,7,11,15,19
4,8,12,16,20

Suggestions


 Show how to add a column, headed 'SUM', of the sums of the rows.
 If possible, illustrate the use of built-in or standard functions, methods, or libraries, that handle generic CSV files.



open #1, "manipy.csv", "r" //existing CSV file separated by spaces, not commas
open #2, "manip2.csv", "w" //new CSV file for writing changed data
 
line input #1 header$ 
header$ = header$ + ",SUM"
print #2 header$
 
while !eof(1)
    input #1 c1, c2, c3, c4, c5
    sum = c1 + c2 + c3 + c4 + c5
    print #2 c1, c2, c3, c4, c5, sum
wend
 
close #1
close #2
end