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.
[R]evolution!
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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...
using a loop...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; }
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; }
Sometimes, the farthest point from the center is the center itself.
Your life is your canvas, it's only as beautiful as you paint it.
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; } }
Free the weed!! Class B to class C is not good enough!!
And the FAQ is here :- http://faq.cprogramming.com/cgi-bin/smartfaq.cgi
