C++ Object-Oriented Programming 003: Very weird return value----(Peking University Mooc)

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Original title

#include <iostream>
using namespace std;

//此处填写 getElement(int * a, int i)
{
    
    
	return a[i];
}
int main()
{
    
    
	int a[] = {
    
    1,2,3};
	getElement(a,1) = 10;
	cout << a[1] ;
	return 0;
}

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Code

int &