Question

This is my attempt at taking an input and then produce an output with the words in the reverse order. Note: I can only use pointers.

    Input: What is your name? 
    Output: name? your is What

I have looked at the other solutions posted here and thought tried to implement them as much as possible but I keep running into problems. Currently it only displays the first letter of the line. I would appreciate any help to fix it!

#include <iostream>
using namespace std;

#include <cstring>

int main( )
{
    char input[255] = {' '};
    char *head, *tail;
    char temp; 
    int i = 0; 

    cin >> input;

    head = input;
    tail = input;

    while(*tail!='\0')
    {
        tail++;
    }

    while (tail <= head){
        temp = *head;
        *head=*tail;
        *tail=temp;

        *head++;
        *tail--;
    }

    cout << input;
    cout << endl;

    return 0;
}

Answer 1

Try this. Without anything referring STL.

#include <iostream>
#include <cstring>
using namespace std;
int main(int argc, char **argv)
{
    char input[255];
    char *head; // head of a word.
    char *tail; // tail of a word.
    cin.getline(input, 255); // read a whole line.
    tail = input + strlen(input) - 1; // if you can use <cstring>?
    while (tail >= input) {
        if (*tail == 0 || *tail == ' ') {
            tail--; // move to the tail of a word.
        } else {
            tail[1] = 0;
            head = tail;
            while (head >= input) {
                if (head == input || *(head - 1) == ' ') {
                    cout << head << " "; // output a word.
                    tail = head - 1; // seek the next word.
                    break;
                }
                head--; // move to the head of a word.
            }
        }
    }
    cout << endl;
    return 0;
}