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Reverse operations with out temporary variable and in-built functions like string reverse.

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  • 1
    with out temporary variable actually I don't suppose such solutions exist.. Commented Apr 14, 2014 at 12:02
  • 2
    You should let us know why you have these constraints, or we may suspect we're just doing your homework assignment for you Commented Apr 14, 2014 at 12:03
  • It is not like that , i encountered such a situation where this can give me a solution in my project. Commented Apr 14, 2014 at 12:07
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    Best elaborate what "without temporaries" means exactly. If there is no loophole to exploit, it's probably impossible. Commented Apr 14, 2014 at 12:26

1 Answer 1

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You can do it using XOR logic like this:

char* rev(char* str)
{
    int end = strlen(str) - 1;
    int start = 0;

    while (start < end)
    {
        str[start] ^= str[end];
        str[end] ^= str[start];
        str[start] ^= str[end];

        ++start;
        --end;
    }

    return str;
}
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