交换a，b的值，小白求指教

Question

#include
void swap(int x, int y)
{
int t;
t = x;
x = y;
y = t;
}
int main()
{
int a = 5, b = 6;
std::cout << "a=" << a << "b=" << b <<std::endl;
swap(a, b);
std::cout << "a=" << a << "b=" << b <<std::endl;
return 0;

}

Answer 1

void swap(int& x, int& y)
{
int t;
t = x;
x = y;
y = t;
}