Where ampersand “&” can be put when passing argument by reference?

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Both are exactly the same. No difference at all.

All that matters is that & should be between the type and the variable name. Spaces don’t matter.

So 

void AddOne(int&  y);
void AddOne(int  &y);
void AddOne(int & y)
void AddOne(int   &     y);
void AddOne(int&y);

are same!

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