how to reverse a string by using array method.?

how to reverse it?
i had tried

Code:

void main()
{
        int i = 30;
        int x;
        char reverse[31];
        char title[31] = "programming concepts and design";

        for(x = 0; x >= 0; x++)
        {
                reverse[x] = title[i];
                i--;
        }

        printf("The reverse order is %s\n", reverse[x]);
}

the result show me is the system error and end of the program immediately.
so what's wrong with the codes, so far i can't detect where im wrong.