public static int suma(int a, int b) {
    if (b == 0) {
        return a;
    } else if (a == 0) {
                  return b;
    } else {
        return 1 + suma(a, b - 1);
    }
}

Line 1: error: expected unqualified-id before 'public'
compilation terminated due to -Wfatal-errors.