void incValue(int &x) {
&nbsp;&nbsp;&nbsp;&nbsp;x++;
}

int main() {
&nbsp;&nbsp;&nbsp;&nbsp;int x = 1;
&nbsp;&nbsp;&nbsp;&nbsp;incValue(x);
&nbsp;&nbsp;&nbsp;&nbsp;cout << x; 
&nbsp;&nbsp;&nbsp;&nbsp;return 0;
}

Here we change `x` as the function works with the address (reference) of this variable. It can be useful in case you need to change the value of the parameters.

What the main difference between passing by value and by reference?

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Pass by Reference