Return Value
On success, the total number of characters written is returned. This count does not include the additional null-character automatically appended at the end of the string.
On failure, a negative number is returned.
Example
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Output:
[5 plus 3 is 8] is a 13 char long string
原文链接: https://www.cnblogs.com/lexus/archive/2012/07/05/2577292.html
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