C++Primer第五版:练习2.11

#include<iostream>

extern int ix = 1024;

int main()
{
    
    
	int iy;
	extern int iz;
}

ix为声明
iy为声明并定义
iz为声明

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转载自blog.csdn.net/Xgggcalled/article/details/108814186
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