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#include<iostream>
using namespace std;
int &Fun(const int &x,int &y,int z)
{ z++;
y = x+y+z;
return y;
}
int main()
{ int a =1,b =2,c =3,d =0;
cout<<"a = "<<a<<" b = "<<b<<" c = "<<c<<" d = "<<d<<endl;
Fun(a,b,c)=20;
cout<<"a = "<<a<<" b = "<<b<<" c = "<<c<<" d = "<<d<<endl;
return 0;
}