Variable exchange: java exchanges the values of two variables.

Variable exchange: java exchanges the values of two variables.
How do I exchange the values of two variables? 1. triplicate method: An intermediate variable is used to exchange data.

　　

 1 #include<iostream> 2 using namespace std; 3 int main() 4 { 5     int a, b; 6     cin >> a >> b; 7     int c = a; 8     a = b; 9     b = c;10     cout << a << ' '<<b << endl;11     return 0;12 }

2. Without intermediate variables: addition and subtraction

 1 #include<iostream> 2 using namespace std; 3 int main() 4 { 5     int a, b; 6     cin >> a >> b; 7     a = a + b; 8     b = a - b; 9     a = a - b;10     cout << a << ' '<< b << endl;11     return 0;12 }

3. without intermediate variables: bitwise (XOR)

 1 #include<iostream> 2 using namespace std; 3 int main() 4 { 5     int a, b; 6     cin >> a >> b; 7     a = a^b; 8     b = a^b; 9     a = a^b;10     cout << a << ' '<<b << endl;11     return 0;12 }

4. Only change the output sequence (for algorithm competitions)

1 #include<iostream>2 using namespace std;3 int main()4 {5     int a, b;6     cin >> a >> b;7     cout << b << ' '<<a << endl;8     return 0;9 }