Question

I am trying to reorder a C string backwards using pointers. In my program I take in the string and then in the for loops I rearrange it.

For example, if I input Thomas, then it should return samohT using pointers.

#include <iostream>
#include <stdio.h>
#include <string.h>
using namespace std;

int main()
{
    int lengthString;

    char name[256];
    cout << "Please enter text: ";
    cin.getline(name, 256);
    cout << "Your text unscrambled: " << name << endl;

    lengthString = strlen(name);

    cout << "length " << lengthString << endl;

    char* head = name;

    char* tail = name;

    for (int i = 0; i < lengthString; i++)
    {
       //swap here?

    }

    for (int j = lengthString - 1; j > -1; j--)
    {
        //swap here?
    }

    return 0;
}

What am I missing in those two loops?

Answer 1

for (int i = 0; i < (lengthString / 2); ++i)
{
    char tempChar = name[i];
    name[i] = name[lengthString - i - 1];
    name[lengthString - i - 1] = tempChar;
}

EDIT :

char* head = name;
char* tail = name + lengthString - 1;
while (head<tail)
{
    char tempChar = *head;
    *head = *tail;
    *tail = tempChar;
    ++head;
    --tail;
}