How to write and implement your own function [closed] - c++

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I need to write my own sqrt function: double my_sqrt_1(double n)
How would I go about doing this? At first I tried putting this outside of "int main()":
double my_sqrt_1(double n)
{
int x = 1;
x = (x + n / x) / 2;
}
I then put this:
int main()
{
cout << "Please enter a value ";
cin >> my_sqrt_1;
cout << '\n' << x;
}
I also tried:
int main()
{
cout << "Please enter a value ";
cin >> my_sqrt_1;
cout << '\n' << my_sqrt_1;
}
None of this worked though. I'm probably doing this completely wrong, but it made sense in my head.

Answer 1

"I'm probably doing this completely wrong ..."
Sorry to say that, but yes.
You need a variable to receive input, and call your function passing that variable
int main() {
cout << "Please enter a value ";
double myNumber;
cin >> myNumber;
cout << '\n' << my_sqrt1(myNumber) << endl;
}
Also your function is supposed to return the result of the calculation
double my_sqrt_1(double n) {
double x = 1.0;
// ^^^^^^ ^^
x = (x + n / x) / 2.0;
// ^^
return x; // <<<<<<<<<<<<<<
}