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syntaxn.语法manipulationn.控制，操作literaln.字面量doublequotationmark双引号linefeed换行符instancen.实例mutabilityn.可变

you use Substring for only a short amount of time while performing actions on a string. when you are ready to store the result for a longer…

1.project->buildpath->addexternalarchives->mysql-connector-java-5.1.49.jaryoucandownloadthispakagefr

unary binary ternary adj. 一元的 二元的 三元的 context n. 情景

the sign of b is ignored for negative values of b. the compound operators don't return a value. you can't write let b = a += 2

read() returns length of binary number it gets and save the number to data. when it reads nothing, read() returns -1. writer() gets numbers…

fundamental adj. 基本的 textual adj. 文本的 extensive adj. 广泛的 swift makes extensive uses of variables whose values can't be changed. constant n.…