String Permutation in C++

StringPerm.cpp

#include <iostream>
#include <cstring>

void swap(char* src, char* dst)
{
       char ch = *dst;
       *dst = *src;
       *src = ch;
}

void permuteString(char* s, int beg, int end)
{
       int i;
       int range = end - beg;
       if (range == 1) {
               std::cout<<s<<std::endl;
       } else {
               for(i=0; i<range; i++) {
                       swap(&s[beg], &s[beg+i]);
                       permuteString(s, beg+1, end);
                       swap(&s[beg], &s[beg+i]);
               }
       }
}

int main()
{
       char str[] = "GOD";
       std::cout<<"The permutations are :- "<<std::endl;
       permuteString(str, 0, strlen(str));
       return 0;
}