For these functions, a printable character is a character with a visible representation;whitespace is one of space, tab, vertical tab, return, newline, and formfeed;
中
函数，可打印字符是指那可以示字符，空白字符则是空格、制符、垂直制符、回车符、换行符和进纸符中任意一种；
For these functions, a printable character is a character with a visible representation;whitespace is one of space, tab, vertical tab, return, newline, and formfeed;
中函数，可打印字符是指那可以示字符，空白字符则是空格、制符、垂直制符、回车符、换行符和进纸符中任意一种；
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