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#include <stdio.h>
// 定义一个静态全局变量
// 静态全局变量只能在其定义的.c文件中任意位置使用，不能跨文件使用
static int num;
void myfun()
{
num++;
}
int main(int argc, char *argv[])
printf("num = %d\n", num);
myfun();
return 0;