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[QUOTE="Sana, post: 3810270"]
Great clue right there. It implies some sort of recursion. So, what
does reversing implies?
Set the value of element in position [strlen(string) - i - 1] with the
value of the element in the position i
hmm, how do we get the length of the string without using strlen? we
call recursively our helper function, each time with an incremented
index into the string until we reach the end of the string. Once we
are there, we return the length (the index of the element with the
value '\0'). Upon returning we now know the length of the string.

// what index do we start with?
int processString(int index, char* string)
{
    // you need to do store something in a variable here

if (string[index] == '\0')
        return index; // the length of the string

// not at the end of the string - call same function recursively
with an incremented index
    int stringLength = processString(index + 1, string);

// here you have the index and the length
    // see how you can use them to set the element [len - i - 1]
    // you will need the value stored in the variable at the begining
of the function

return stringLength;
}

HTH
[/QUOTE]

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