override the operator overloading in C++ ?

Programmer Question

helo guys

i have class call Complex

I did operator overloading like such

Complex c = a + b; // where a and b are object of Complex class 

which basically is operator+(Complex& that);

but I dont know how to say for example

double c = a + 10; //where a is object of Complex class but 10 is integer / double  

I did define typecasting for a to be double get my IDE says that there are too many operands + and it somehow complains for not being able to "understand" the +

it has to be in this format though double c = a + 10;

thanks

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