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Well Good but Known Question.

1> Primarily the answer is Return type plays no Role in this mechanism and if someOne mistakenly did than in C++ compiler shouts...
2> However in different argument variable types. Actually C++ Compiler optimizes the function Name in Symbol Table by appending internal reference mechanism which can be deference internally. This is clearly visible if some one check the polymorphism using virtual pointer and virtual table.

If there are two overloaded functions like
Add(float,int);
Add(int,float);

Compiler will generate unique identifier to identify these functions, and these identifier may look like these respectively.

Add_int_float
Add_float_int

C++ does not support overloading by return type. Other languages might, if they can infer from context which type is needed in a particular expression.

not sure but chk this.
generallly associativity of assignment operator is Right To Left. so in an assignment operator function is first called, and that point f time it does not know about the right hand side variable's data type and i think this is the reason for compiler not supporting overload of function having same signature but diff return type.
please correct me if i m wrong

complier internally coverting like that
char add(int,char)----->_z23aic
char add(int,float)----->_z23aif
so here _z23 is return type so return type not checking

Its called Name mangling supported in c++ and not in c that is why c++ supports function overloading and c does not.

hi