【单选题】【消耗次数：1】
一个程序文件中必须有并且只有一个命名为（ ）的函数。
①
Main
②
main
③
void
④
intmain
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如果一个函数位于C程序文件的上部，在该函数体内说明语句后的复合语句中定义了一个变量，则该变量
①
为全局变量，在本程序文件范围内有效
②
为局部变量，只在该函数内有效
③
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定义无效，为非法变量
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