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C C++ interview questions

!!! C C++ interview questions !!!

What is reference ??



reference is a name that acts as an alias, or alternative name, for a previously defined variable or an object. prepending variable with "&" symbol makes it as reference. for example:
int a;
int &b = a;
What is passing by reference?
Method of passing arguments to a function which takes parameter of type reference. for example:
void swap( int & x, int & y )
{
int temp = x;
x = y;
y = x;
}
int a=2, b=3;
swap( a, b );
Basically, inside the function there won't be any copy of the arguments "x" and "y" instead they refer to original variables a and b. so no extra memory needed to pass arguments and it is more efficient.

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