C CODE FOR ACKERMANN FUNCTION

 #include <stdio.h>

int ackermann(int m, int n);

int main()

{

    int m, n;

    printf("ENTER TWO NON-NEGATIVE INTEGERS: \n");

    scanf("%d%d", &m, &n);

    printf("THE RESULT OF ACKERMANN FUNCTION IS %d \n", ackermann(m, n));

    return 0;

}

int ackermann(int m, int n)

{

    if (m == 0)

    {

        return (n + 1);

    }

    else if (m > 0 && n == 0)

    {

        return (ackermann(m - 1, 1));

    }

    else if (m > 0 && n > 0)

    {

        return (ackermann(m - 1, ackermann(m, n - 1)));

    }

}