From Cppreference
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int rename( const char *old_filename, const char *new_filename );
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Changes the filename of a file. The file is identified by character string pointed to by old_filename. The new filename is identified by character string pointed to by new_filename.
[edit] Parameters
old_filename
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pointer to a null-terminated string containing the path identifying the file to rename
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new_filename
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pointer to a null-terminated string containing the new path of the file
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[edit] Return value
0 upon success or non-zero value on error.
[edit] Example
[edit] See also