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写出下列程序的执行结果是：__________________。#includeusing namespace std;void func( int, int, int & );void main(){ int x=0 , y=1 , z=2; func( 1 , 2 , x ); func( x + y , y , y ); func( z , x + y , z ); cout << x << "," << y << ","<< z << endl ;}void func( int a , int b , int &c ){ b += a ; c = b - a ; }

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