File handling in C -urgent help required!!!

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Hi ,
i have a file .txt as below,which will be a input file

#test
attr1
attr2
attr3

i want to read the file and keep all these attributes in a vector or array using C.
and need to iterate through the vector and append few string and write the only the attributes to a file (or save in some location,hard coding location is okay
i am a beginner to programming.Appreciate for your help.

o/p file will be as below

attr1 = somevalu1
attr2 = somevalue2
..

please help urgent!!!

Posted 10-Mar-15 6:50am

ramina sen

Updated 10-Mar-15 10:46am

Sergey Alexandrovich Kryukov

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Sergey Alexandrovich Kryukov 10-Mar-15 16:47pm

Vector? Did you mean C++ then, not C? :-)
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-03-10T10:52:00

Please see:
https://www.cs.bu.edu/teaching/c/file-io/intro[^],
http://en.wikipedia.org/wiki/C_file_input/output[^].

Note that C arrays are of fixed size. Even though you can resize the vector, this is actually reallocation, which is not reasonable efficient:
http://randu.org/tutorials/c/dynamic.php[^],
http://forum.codecall.net/topic/51010-dynamic-arrays-using-malloc-and-realloc[^].

Therefore, it would be much better to change the file format and write the number of records (lines, whatever it is) in first line, as well as all other metadata you may need. This "prefix" approach is much more efficient, as you can allocate array memory only once, in the very beginning.

See also: http://en.wikipedia.org/wiki/Metadata[^].

—SA

Richard MacCutchan · Answer 2 · 2015-03-10T07:03:00

Solution 1

No it's not urgent. And you can learn about file handling at any of the following links: https://www.google.co/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=readfile%20c[^].

Posted 10-Mar-15 7:03am

Richard MacCutchan