C++ Example - Swap Two Numbers
Below we use two methods to swap two variables: using a temporary variable and without using a temporary variable.
Example - Using a Temporary Variable
#include <iostream>
using namespace std;
int main()
{
int a = 5, b = 10, temp;
cout << "Before swapping:" << endl;
cout << "a = " << a << ", b = " << b << endl;
temp = a;
a = b;
b = temp;
cout << "\nAfter swapping:" << endl;
cout << "a = " << a << ", b = " << b << endl;
return 0;
}
The output of the above program is:
交换之前： a = 5, b = 10 交换之后： a = 10, b = 5
Example - Without Using a Temporary Variable
#include <iostream>
#include <iostream>
using namespace std;
int main()
{
int a = 5, b = 10;
cout << "Before swapping:" << endl;
cout << "a = " << a << ", b = " << b << endl;
a = a + b;
b = a - b;
a = a - b;
cout << "\nAfter swapping:" << endl;
cout << "a = " << a << ", b = " << b << endl;
return 0;
}
The output of the above program is:
交换之前： a = 5, b = 10 交换之后： a = 10, b = 5other extensions