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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, y, z; func( 5, 6, &x ); func( 7, x, &y ); func( 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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