pass by reference demo

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#include <iostream>using namespace std;template <typename T>void exchange(T &t1, T &t2);int main(){    int m = 10, n = 99;    exchange(m, n);    cout << m << " " << n << endl;    return 0;}template <typename T>void exchange(T &t1, T &t2) {    T temp = t1;    t1 = t2;    t2 = temp;}

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