Names should be formed from the 26 upper and lower case letters (A .. Z, a .. z), the 10 digits (0 .. 9), and _ (underbar).
变量名应由26个大小写字母(A..Z,a..z),10个数字(0..9),和_(下划线)组成。
Names should be formed from the 26 upper and lower case letters (A .. Z, a .. z), the 10 digits (0 .. 9), and _ (underbar).
变量名应由26个大小写字母(A..Z,a..z),10个数字(0..9),和_(下划线)组成。
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