I’m a beginner and as an exercise I tried to create a function which gets an array of integers as input and returns their maximum.

Here’s the code:

#include <iostream>

int maximum(int setOfNumbers[]);

int main()
{
    int a[] = {1, 2};
    std::cout << maximum(a);

    return 0;
}

int maximum(int setOfNumbers[])
{
    int value = setOfNumbers[0];
    for (int n : setOfNumbers)
    {
        value = std::max(n, value);
    }
    return value;
}

and this error is what I receive:

demo.cpp: In function 'int maximum(int*)':
demo.cpp:16:18: error: 'begin' was not declared in this scope; did you mean 'std::begin'?
   16 |     for (int n : setOfNumbers)
      |                  ^~~~~~~~~~~~
      |                  std::begin
In file included from C:/msys64/mingw64/include/c++/13.2.0/string:53,
                 from C:/msys64/mingw64/include/c++/13.2.0/bits/locale_classes.h:40,
                 from C:/msys64/mingw64/include/c++/13.2.0/bits/ios_base.h:41,
                 from C:/msys64/mingw64/include/c++/13.2.0/ios:44,
                 from C:/msys64/mingw64/include/c++/13.2.0/ostream:40,
                 from C:/msys64/mingw64/include/c++/13.2.0/iostream:41,
                 from demo.cpp:1:
C:/msys64/mingw64/include/c++/13.2.0/bits/range_access.h:114:37: note: 'std::begin' declared here
  114 |   template<typename _Tp> const _Tp* begin(const valarray<_Tp>&) noexcept;
      |                                     ^~~~~
demo.cpp:16:18: error: 'end' was not declared in this scope; did you mean 'std::end'?
   16 |     for (int n : setOfNumbers)
      |                  ^~~~~~~~~~~~
      |                  std::end
C:/msys64/mingw64/include/c++/13.2.0/bits/range_access.h:116:37: note: 'std::end' declared here
  116 |   template<typename _Tp> const _Tp* end(const valarray<_Tp>&) noexcept;
      |                                     ^~~

Any idea?

PS: I know there is a way of doing this by the normal for-loop, but I’m interested to find out what’s wrong in this foreach-loop and how to fix it.