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Recent Questions

!!! C C++ Frequently Asked Questions !!!

When are temporary variables created by C++ compiler?

SCJP 1.5/1.6 Exam Kit

!!!Answer!!!- From Technical Expert

Provided that function parameter is a "const reference", compiler generates temporary variable in following 2 ways.
a) The actual argument is the correct type, but it isn't Lvalue
double Cuberoot ( const double & num )
{
num = num * num * num;
return num;
}
double temp = 2.0;
double value = cuberoot ( 3.0 + temp ); // argument is a expression and not a Lvalue;
b) The actual argument is of the wrong type, but of a type that can be converted to the correct type
long temp = 3L;
double value = cuberoot ( temp); // long to double conversion

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