That will throw an error coz in the second function the 
return type is double and result will be in double. to 
rectify it we need to convert the second function result as 
double, then the code executes correctly.

it will throw an error because the function overloading is 
acheived by
1) changing the number of parameters
2) changing the order of parameters of different datatypes

we can't acheive function overloading by changing the 
return type

it will throw compile error because of same parameter's 
data type in second overloaded function.

C#: CIL supports overloading by return type

C# and most other languages that allow method overloading do
not allow overloading by return type. What this means is
that methods can be overloading only if they differ by
parameters. So the following code will not compile as the
methods differ only by return type

class Employee

{

//...

}

class Program

{

static int Func(Employee emp) {

return emp.Id;

}

static string Func(Employee emp) {

return emp.Name;

}

}