1 #include <iostream>
 2 
 3 using namespace std;
 4 
 5 void func(int &a, int &b, int &c);
 6 int main()
 7 {
 8     int A = 1;
 9     int B = 3;
10     int C = 0;
11 
12     func(A,B,C);
13 
14     cout << "C = " << C << endl;
15     cout << "B = " << B << endl;
16     cout << "A = " << A << endl;
17 
18     system("pause");
19     return 0;
20 
21 }
22 
23 
24 void func(int &a, int &b, int &c)
25 {
26     c = b - a;
27     a = b;
28 }