Mega Code Archive
Pass by reference by using pointer
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#include <iostream>
void swap(int *x, int *y);
int main()
{
int x = 5, y = 10;
std::cout << "Main. Before swap, x: " << x << " y: " << y << "\n";
swap(&x,&y);
std::cout << "Main. After swap, x: " << x << " y: " << y << "\n";
return 0;
}
void swap (int *px, int *py)
{
int temp;
std::cout << "Swap. Before swap, *px: " << *px << " *py: " << *py << "\n";
temp = *px;
*px = *py;
*py = temp;
std::cout << "Swap. After swap, *px: " << *px << " *py: " << *py << "\n";
}
Main. Before swap, x: 5 y: 10
Swap. Before swap, *px: 5 *py: 10
Swap. After swap, *px: 10 *py: 5
Main. After swap, x: 10 y: 5
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