C++ Reverse Array

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Despite this looking quite homeworky, may I suggest:

void reverse(char word[])
{
    int len=strlen(word);
    char temp;
    for (int i=0;i<len/2;i++)
    {
            temp=word[i];
            word[i]=word[len-i-1];
            word[len-i-1]=temp;
    }
}

or, better yet, the classic XOR implementation:

void reverse(char word[])
{
    int len=strlen(word);
    for (int i=0;i<len/2;i++)
    {
        word[i]^=word[len-i-1];
        word[len-i-1]^=word[i];
        word[i]^=word[len-i-1];
    }
}

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