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9, What does this program print? package javaapplication210; public class JavaApplication210 public static void main(Stringllargs) system out.printfu Result is: %dn, mystery(-5, -9)): llor System.out printf Result is: %din, mystery(-4,-8) lior System out print Result is: %din, mystery 7) llo public static int mystery( int a int b) if (b 1) return a else return at mystery( a, b 1);


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Answer #1

The program shows the run time error :

Exception in thread "main" java.util.MissingFormatArgumentException: Format specifier '%d'

Modified code :

public class HelloWorld{

public static void main(String []args){
System.out.printf("Result is:"+mystery(-5,-9)+"\n"); // calling function
System.out.printf("Result is:"+mystery(-4,-8)+"\n");   // calling function
System.out.printf("Result is:"+mystery(-6,-7)+"\n");   // calling function
}
public static int mystery(int a,int b)
{
if(b==1)
return a;
else
return a+mystery(a,b+1);
}
}

Outptput :

- Default Term +Browser sh-4.39 javac Javapplication210.java sh-4.3$ java -Xmx128M -Xmsl6M Javapplication210 Result is:-55 Re

If the arguments are (-5,-9).

  if(b==1)

It runs from b value -9 to 1, the value of b incremented until b==1

Therefore it runs for 11 times.

So the value is -5 is added to the varible, thus the values are like -5, -10, ........-55 (Here 10 times it calls)

return a+mystery(a,b+1);

Similarly

(-4,-8)

It runs for 10 times. The values are -4, -8, -12......

(-6,-7)

It runs for 9 times. The values are -4, -8, -12......

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