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fopen update use r+ mode
"r+" Open a file for update both reading and writing. The file must exist.
fopen - C++ Reference
http://www.cplusplus.com/reference/clibrary/cstdio/fopen/
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fopen update use r+ mode
"r+" Open a file for update both reading and writing. The file must exist.
fopen - C++ Reference
http://www.cplusplus.com/reference/clibrary/cstdio/fopen/