#include<iostream>
#include<cctype>
#include<algorithm>
using namespace std;

int main(){

	string mixed_case = "The elephant could not fit into the heat vent";
	for(int i = 0; i < mixed_case.length(); i++)
		mixed_case[i] = toupper(mixed_case[i]);
	cout << mixed_case << endl;

	char c_mixed_case[] = "So it filled the heat vent with water instead";
	for(char *i = c_mixed_case; *i; i++)
		*i = toupper(*i);
	cout << c_mixed_case << endl;

	string mixed_case_3 = "The water ran down the vent and dripped into the furnace";
	for(string::iterator i = mixed_case_3.begin(); i != mixed_case_3.end(); i++)
		*i = toupper(*i);
	cout << mixed_case_3 << endl;

	string mixed_case_4 = "The furnace started to make weird sounds, which scared the elephant";
	for(auto &i : mixed_case_4)
		i = toupper(i);
	cout << mixed_case_4 << endl;

	std::string mixed_case_5 = "That made a lot of noise, which scared a raccoon out of the attic";
	std::transform(mixed_case_5.begin(), mixed_case_5.end(), mixed_case_5.begin(), ::toupper );
	std::cout << mixed_case_5 << std::endl;
	
	return 0;
}