java - Missing return statement Error -

i started writing recursive methods. 1 of methods powers of ten giving me missing return type error.

public static double poweroften(int n) {   if (n == 0)   return 1;   if(n > 0)   return (10 * poweroften(n - 1));   if(n < 0)   return (1 / poweroften(n - 1));  } 

i'm pretty new explanation appreciated.

////// edit worked out me, negative , positive powers of ten. :d

public static double poweroften(int n) {   if(n > 0)   return (10 * poweroften(n - 1));   if(n < 0)   return (1 / poweroften( (-1)*(n) ));    return 1;  } 

try:

public static double poweroften(int n) {  if(n > 0)   return (10 * poweroften(n - 1));   if(n < 0)   return (1 / poweroften(n - 1));    return 1; } 

the compiler thinks can't guarantee there's value being returned since returns in if statements. doing way takes away confusion