WebYou declare the existence of global variables in a header, so that each source file that includes the header knows about it, but you only need to “define” it once in one of your source files. To clarify, using extern int x; tells the compiler that an object of type int called x exists somewhere. Web/* in file main.c*/ #include int main() { int a = 3, b = 4; int c = sum(a, b); printf("%d\n", c); } 和 /* In file sum.c */ #include int sum(int x, int y) { return x + y; } 然后，我編譯了gcc main.c sum.c ，沒有錯誤，結果是正確的。

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WebDec 4, 2014 · The extern keyword introduces a variable declaration, not a definition. It says that somewhere in some source file there will be a variable defined with the given … You declare the existence of global variables in a header, so that each source file that includes the header knows about it, but you only need to “define” it once in one of your source files. To clarify, using extern int x; tells the compiler that an object of type int called x exists somewhere. mapa de la division politica europea

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Web3.Stocktransfer between two plants without delivery (MM STO): Thisprocess is also called as MM STO, but many of the companies will use intra orinter process because of … Web这里使用int2类型展示了CUDA矢量类型可以在C++代码中使用。int2是一个包含两个整数（x和y）的结构体。 将输入数据（字符数组）复制到int2数组，将每个字符的ASCII值赋 … WebThe static external variable is defined with a keyword static The characteristics of an static external variable is similar to that of an external variable; however, a static external variable can not be accessed from another file. register STORAGE CLASS Variables of storage class have the same scope and lifetime as auto variables. crontab configure