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#include <iostream>
#include <algorithm>
#include <string>
 
int main() {
 
        using namespace std;
 
        string str = "HELLO WORLD";
 
        transform( str.begin(), str.end(), str.begin(), std::tolower<string::value_type> );
 
        cout << str << endl;
}

In file included from /usr/lib/gcc/i686-pc-linux-gnu/4.5.1/../../../../include/c++/4.5.1/algorithm:63:0,
                 from prog.cpp:2:
/usr/lib/gcc/i686-pc-linux-gnu/4.5.1/../../../../include/c++/4.5.1/bits/stl_algo.h: In function '_OIter std::transform(_IIter, _IIter, _OIter, _UnaryOperation) [with _IIter = __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >, _OIter = __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >, _UnaryOperation = char (*)(char, const std::locale&)]':
prog.cpp:11:90:   instantiated from here
/usr/lib/gcc/i686-pc-linux-gnu/4.5.1/../../../../include/c++/4.5.1/bits/stl_algo.h:4688:2: error: too few arguments to function

Standard output is empty