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#include <iostream> using namespace std; void swap(int& x, int& y) { int temp = x; x = y; y = temp; } int main() { int a = 10; int b = 20; cout << "Before swapping: a = " << a << ", b = " << b << endl; swap(a, b); cout << "After swapping: a = " << a << ", b = " << b << endl; return 0; }

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