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int fun() {
   static int a = 1;
   a++;
}
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int a = 1;
int fun() {
   a++;
}
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#include <iostream>
using namespace std;
class A {
public:
    static int num;    //    Í³¼Æ´´½¨Á˶àÉÙ¸öʵÀý
    A () {num++};    //    Ã¿´´½¨Ò»¸öʵÀý£¬¾ÍÈÃnum×ÔÔö1
    //    ·µ»ØÍ¨¹ý¹¹Ô캯ÊýËù´´½¨¹ýµÄAÀàʵÀýµÄÊýÄ¿
    static int how_many_instance() {
        return num;
    }
}
static A::num = 0;    //    ÐèÒªÔÚÀàÉêÃ÷µÄÍⲿµ¥¶À³õʼ»¯£¡
int main() {
    cout << A::how_many_instance() << endl;
    A a, b, c, d;
    cout << A::how_many_instance() << endl;
 


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