error: expected initializer before 'std' and other errors after adding one line to working code - namespaces

Question

The following program worked already before I added line 12, the line reading:
" std::cout<<" Natürlicher Logarithmus von ";std::cin>>X; ".
Now I get a lot of errors (see below)!
Please Help
// Berechnung des natürlichen Logarithmus (Grenzwert nach Hurwitz)
#include <iostream>
#include <cmath>
#include <iomanip>
double h{1.0},Result,oldResult,Limit{1.0e-8},X{2.0},Inkr;
int c{0}, prez;
int main()
std::cout<<" Natürlicher Logarithmus von ";std::cin>>X;
std::cout<<" Genauigkeit (Zehnerpotenz): ";
std::cin>>prez; prez=std::abs(prez);
Limit=std::pow(10,-prez-1);
Result=((std::pow(X,h))-1)/h;
do
{
oldResult=Result;
h=h/2.0;
Result=((std::pow(X,h))-1)/h;
Inkr=std::abs(oldResult-Result);
++c;
}
while (Inkr>Limit);
Result=std::round(Result*std::pow(10,prez))*std::pow(10,-prez);
std::cout<<std::setw(prez+3)<<std::setprecision(prez)<<std::fixed<<Result<<" \t"<<c<<'\n';
return(0);
}
Logarithmun.cpp:12:5: error: expected initializer before 'std'
12 | std::cout<<" Nat├╝rlicher Logarithmus von ";std::cin>>X;
| ^~~
Logarithmun.cpp:12:53: error: 'cin' in namespace 'std' does not name a type
12 | std::cout<<" Nat├╝rlicher Logarithmus von ";std::cin>>X;
| ^~~
In file included from Logarithmun.cpp:3:
C:/msys64/mingw64/include/c++/12.2.0/iostream:60:18: note: 'std::cin' declared here
60 | extern istream cin; /// Linked to standard input
| ^~~
Logarithmun.cpp:13:10: error: 'cout' in namespace 'std' does not name a type
13 | std::cout<<" Genauigkeit (Zehnerpotenz): ";
| ^~~~
C:/msys64/mingw64/include/c++/12.2.0/iostream:61:18: note: 'std::cout' declared here
61 | extern ostream cout; /// Linked to standard output
| ^~~~
Logarithmun.cpp:14:10: error: 'cin' in namespace 'std' does not name a type
14 | std::cin>>prez; prez=std::abs(prez);
| ^~~
C:/msys64/mingw64/include/c++/12.2.0/iostream:60:18: note: 'std::cin' declared here
60 | extern istream cin; /// Linked to standard input
| ^~~
Logarithmun.cpp:14:21: error: 'prez' does not name a type
14 | std::cin>>prez; prez=std::abs(prez);
| ^~~~
Logarithmun.cpp:15:5: error: 'Limit' does not name a type
15 | Limit=std::pow(10,-prez-1);
| ^~~~~
Logarithmun.cpp:16:5: error: 'Result' does not name a type
16 | Result=((std::pow(X,h))-1)/h;
| ^~~~~~
Logarithmun.cpp:18:5: error: expected unqualified-id before 'do'
18 | do
| ^~
Logarithmun.cpp:26:5: error: expected unqualified-id before 'while'
26 | while (Inkr>Limit);
| ^~~~~
Logarithmun.cpp:28:5: error: 'Result' does not name a type
28 | Result=std::round(Result*std::pow(10,prez))*std::pow(10,-prez);
| ^~~~~~
Logarithmun.cpp:29:10: error: 'cout' in namespace 'std' does not name a type
29 | std::cout<<std::setw(prez+3)<<std::setprecision(prez)<<std::fixed<<Result<<" \t"<<c<<'\n';
| ^~~~
C:/msys64/mingw64/include/c++/12.2.0/iostream:61:18: note: 'std::cout' declared here
61 | extern ostream cout; /// Linked to standard output
| ^~~~
Logarithmun.cpp:31:5: error: expected unqualified-id before 'return'
31 | return(0);
| ^~~~~~
Logarithmun.cpp:32:1: error: expected declaration before '}' token
32 | }
| ^
I did remove line 12, but the errors remain.
So I obviously changed inadvertently something fundamental but I cannot find the problem. I do not understand the error at all! I used similar code a lot already.