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#include <iostream>
#include <string>
using namespace std;
 
void func (const string &s)
{
    for(string::iterator st=s.begin();st!=s.end();++st) cout << *st;
    return;
}
 
int main()
{
    string s="Ala ma kota"; func(s);
     return 0;
}

prog.cpp: In function ‘void func(const string&)’:
prog.cpp:7:37: error: conversion from ‘std::basic_string<char>::const_iterator {aka __gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >}’ to non-scalar type ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ requested
     for(string::iterator st=s.begin();st!=s.end();++st) cout << *st;
                                     ^

Standard output is empty