How to reverse the string - c++

Question

I'm a beginner at coding and was given a project by a friend to reverse the order of a string inputted by the user, however when I run this code the program just repeatedly prints the string inputted many times over and I'm not sure whats wrong.
For instance, I input "hi", it just prints "hi" many times. I have tried using cin, getline and scanf (as recommended by a friend), but to no avail...
#include <iostream>
using namespace std;
int main()
{
char arr[5];
getline(cin, arr);
for(int x=4; x>=0; x--){
cout << arr << endl;
}
return 0;
}

Answer 1

Since the question is tagged C++, you should use C++ constructs such as std::string and std::reverse. This will result in more readable and understandable code.
#include <string>
#include <iostream>
#include <algorithm>
int main()
{
std::string input;
std::getline(std::cin, input);
std::reverse(input.begin(), input.end());
std::cout << input << std::endl;
return 0;
}

Answer 2

This line is wrong:
cout << arr << endl;
You have to use the index operator [] like this:
cout << arr[x];
Note that there is no endl, as that would print every character in a new line.
Using arr[x] gives you the element of the array (or character of the string if you will) at index x. Please note that element indexes in C++ start at 0. So the first element is arr[0], second arr[1], and so on.
Also, why use a C-style char array of only size 5? You can use the C++ std::string just as effectively and it will work for larger strings:
string x;
getline(cin, x);
for (int i = x.size() - 1; i >= 0; i--)
{
cout << x[i];
}
cout << endl;
Hope this helps.

Answer 3

When you write, cout << arr << endl; you are printing the entire string in each iteration of the loop. Instead, you wish to print the character at the index x, so you should write it as cout << arr[x]; If you use endl inside the loop, you will get a new line after each character.
Moreover, in C++, there is an easier way to deal with strings, using the string library. Then, you need not specify the number of characters in your string beforehand, and helps if the user needs to enter more than 4 characters.
#include <iostream>
#include <string>
using namespace std;
int main()
{
string arr;
getline(cin, arr);
for(int x=arr.size()-1; x>=0; x--){
cout << arr[x];
}
cout << endl;
return 0;
}

Answer 4

What's happening is you're sending the entire contents of arr to cout 5 times. What you want instead is to print each character in reverse; to do this, you need to send only one character of arr at a time inside your for loop:
cout << arr[x] // This sends the character at index x to cout
cout << arr // This sends the entire array to cout
Also, you should have cout << endl after the for loop; otherwise, you'll print a newline character after each letter.

Answer 5

Alternate solution using iterators:
#include <iostream>
#include <iterator>
#include <algorithm>
#include <string>
int main()
{
std::string input;
getline(std::cin, input);
for (std::string::reverse_iterator rit=input.rbegin(); rit!=input.rend(); ++rit)
std::cout << *rit;
return 0;
}