How to reverse a string using a recursive function, without
swapping or using an extra memory?




Answer Posted / ozzy

#include <stdio.h>
#include <string.h>

int recreverse (char szStr[], int nSize, int i)
{
// printf ("\n %d - %s ", i, szStr);

if (i < nSize /2)
{
szStr[i] ^= szStr[nSize -(i + 1)];
szStr[nSize -(i + 1)] ^= szStr[i];
szStr[i] ^= szStr[nSize -(i + 1)];

recreverse (szStr, nSize, ++i);
}
else
return;



}

int main()
{
char szStr[256];
int nSize,i;
char cChar;
// int nHash[26] = {0};
// char szDict[26] ="abcdefghijklmnopqrstuvwxyz";

printf("\n Enter the character : ");
// scanf("%s,", szStr);
gets(szStr);
nSize = strlen (szStr);
printf ("\n string %s - %d \n", szStr, nSize);

recreverse (szStr, nSize, 0);


printf ("\n Reverse <<%s>> \n", szStr);

}

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