Reversing A String?

I need to know how to reverse a string using C++?

I have been told the best way to do this is by using Pointers but I am unable to find a way to make it work. :(

And, yes I am aware there is probably a really easy way to do this but my brain isn't working.

Hi,
using MFC(CString) but same algorythm should work for other strings, too.

(except index might be zero-based)
--------------------the function-----
CString CReverseStringDlg::ReverseString( CString* string_in )
{
CString aTempString;

unsigned int aStrlen = string_in->GetLength();
TCHAR ch;
for ( unsigned int i = 1; i <= aStrlen; i++ )
{
ch = string_in->GetAt( aStrlen - i );
aTempString.Insert( i, ch );
}

return ( aTempString );
}

--------------------the call------------
CString aString;

aString = "123456789";
aString = ReverseString( &aString );

// now aString is "987654321"
Have fun.

Hi. Thanks for the quick reply. I actually managed to find a soloution of my own :-)

If your interested;


void displayinreverse()
{
cout << "The Text Reversed Is: ";
string name = line; // line is the variable used in the cin
int nLength=name.length();
for (int i=nLength-1;i>=0;i--)
cout << line[i];
cout << endl;
}

Thanks again for your help though :-)

using strrev function...

Code:

---

#include<iostream.h>
#include<string.h>

int main()
{
        char bud[255];

        cout<<"Enter a string\n";
        cin.getline(bud, 255, '\n');

        cout<<"\nString before reversal: \n";
        cout<<bud;
        cout<<"\n";
       
        strrev(bud);

        cout<<"\nString after reversal: \n";
        cout<<bud;
        cout<<"\n";

        return 0;
}

---

using a loop...

Code:

---

#include<iostream.h>
#include<string.h>

int main()
{
        char BAK[255]="", bud[255]="";
        int h,i;

        cout<<"Enter a string\n";
        cin.getline(bud, 254,'\n');

        cout<<"\nString before reversal: \n";
        cout<<bud;
        cout<<"\n";


        i = strlen(bud);
        for(h=0; i>0; i--)
        {
                BAK[h] = bud[i-1];
                h++;
        }

        cout<<"\nString after reversal: \n";
        cout<<BAK;
        return 0;
}

---

heres how to do it with pointers....

Code:

---

void Reverse(char* pData)

{
        char temp; //holding area
        int Length=strlen(pData);
                char* start=pData; //first char
        char* last=pData+Length-1;//last char before null
        while (start<last) // stops at midpoint
                {
                        temp=*start;
                        *start=*last;
                        *last=temp;
                        ++start;
                        --last;
                }
}

---