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#include<cstdlib>
#include<iostream>
using namespace std;
int squareByValue(int);
void squareByReference(int &);
int main(){
     int x = 2,z = 4;
     cout << "x = " << x << " before squareByValue\n"
             << "Value returned by squareByValue:"
             << squareByValue(x) << endl
             << "x= " << x << " after squareByValue\n" << endl;
     cout << "z= " << z << " before squareByReference" << endl;
     squareByReference(z);
     cout << "z= " << z << " after squareByReference" << endl;
     return 0;
}
int squareByValue(int a){
        return a *= a;
}
void squareByReference(int &cRef){
        cRef *= cRef;
}


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