Assume that a file exists. How to replace the occurrence of a character with another character?

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Is this your assignment or something else? http://www.thirumal.in/2012/01/replacing-characters-in-file-c.html looks complete but if this is homework, ignore the web and write something. Share your code and tell why you think it didn't work.

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If the file will all fit into memory, then the better (much faster) method is to read the whole file into dynamic memory ... traverse that data and update as desired ... then write all that updated data back to the (overwritten) file.

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