Language: C++

#include <iostream>
#include <string>
using namespace std;


int main() {

	int i=0;
	string str;
	getline(cin,str,256);
	
	for(i=0;i<str.size();i++){
		if (isupper(str[i]))
			str[i] = tolower(str[i]);
	}
	
	int nom[26];
	char alpha[26];
	
	for (i=0;i<26;i++){
		nom[i] = 0;
		alpha[i] = 97 + i;
	}
	
	
	for (i=0;i<str.size();i++){
		nom[str[i]-97]++;
	}
	
	for (i=0;i<26;i++){
		cout <<alpha[i]<<" : "<<nom[i]<<endl;
	}
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:16: error: no matching function for call to 'getline(std::istream&, std::string&, int)'
   10 |         getline(cin,str,256);
      |         ~~~~~~~^~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:55,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.tcc:907:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&, _CharT)'
  907 |     getline(basic_istream<_CharT, _Traits>& __in,
      |     ^~~~~~~
/usr/include/c++/14/bits/basic_string.tcc:907:5: note:   template argument deduction/substitution failed:
a.cc:10:16: note:   deduced conflicting types for parameter '_CharT' ('char' and 'int')
   10 |         getline(cin,str,256);
      |         ~~~~~~~^~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:54:
/usr/include/c++/14/bits/basic_string.h:4117:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 4117 |     getline(basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:4117:5: note:   candidate expects 2 arguments, 3 provided
/usr/include/c++/14/bits/basic_string.h:4125:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&, _CharT)'
 4125 |     getline(basic_istream<_CharT, _Traits>&& __is,
      |     ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:4125:5: note:   template argument deduction/substitution failed:
a.cc:10:16: note:   deduced conflicting types for parameter '_CharT' ('char' and 'int')
   10 |         getline(cin,str,256);
      |         ~~~~~~~^~~~~~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4132:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 4132 |     getline(basic_istream<_CharT, _Traits>&& __is,
      |     ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:4132:5: note:   candidate expects 2 arguments, 3 provided
In file included from /usr/include/c++/14/cstdio:42,
                 from /usr/include/c++/14/ext/string_conversions.h:45,
                 from /usr/include/c++/14/bits/basic_string.h:4154:
/usr/include/stdio.h:697:18: note: candidate: '__ssize_t getline(char**, size_t*, FILE*)'
  697 | extern __ssize_t getline (char **__restrict __lineptr,
      |                  ^~~~~~~
/usr/include/stdio.h:697:45: note:   no known conversion for argument 1 from 'std::istream' {aka 'std::basic_istream<char>'} to 'char**'
  697 | extern __ssize_t getline (char **__restrict __lineptr,
      |                           ~~~~~~~~~~~~~~~~~~^~~~~~~~~