Puzzle 16 – The ‘=’ puzzle

Language – Java/C++ | Type – Problem (Code) | Last date 19-Apr-2009 12:00 p.m. IST | Points 5

I was attending a session the other day and the instructor was adamant that the Java language is pretty cool (which it is – I just love it). To illustrate his point he referred to the fact that we cannot use a ‘=’ sign in a ‘if condition’ causing problems like it did in C/C++.

"Of course you can use a single = to in a 'if condition'. I have seen that happen so many times" I blurred out. "No way" he challenged. Care to take up this challenge for me?

Got an answer? Why don’t you leave it here.

Puzzle 10 – Go forth and multiply.

Language – Java | Type – Problem (Code) | Last date 29-Mar-2009 | 12:00 p.m. IST | Points 5

Here I was quietly doing my work (Ok ok I was playing mind sweeper) when my manager comes to me and ask me to write a code that could multiple two floating point numbers for him. Why he does not use a calculator, I cannot imagine, but I started to write the program anyway.
As you know my key board gives me a lot of trouble and the ‘*’ sign does not work. Help me out folks!

Write a program to multiple two floating point numbers.
Twist: Do not use the “*” (multiplication sign) in the entire program.

Got an answer? Why don’t you leave it here.

Puzzle 9 – Double Fun

Language – Java | Type – Concept | Last date 25-Mar-2009 9:00 p.m. IST | Points 2

The other day I started writing code for a mission critical application – and I needed to loop over. Bored with the standard integer way of looping I decided to be adventurous and used doubles instead. Can you tell me if I am doing something wrong out here?

1 package com.twisters;
2 public class MyDouble {
3     public static void main(String[] args) {
4         for(double d = 0.0; d != 1.0; d = d + 0.1){    
5             System.out.println("Doing a strategic thing here…");
6         }
7     }
8 }

Got an answer? Why don’t you leave it here.

Puzzle 8 – Misleading Count.

Language – Java | Type – Concept | Last date 22-Mar-2009 12:00 p.m. IST | Points 2

This is why ‘i’ am so important …

package com.twisters;
public class MyLoop {
  public static void main(String[] args) {
    for(int i=0;i<10;i++){
      for(i=0;i<5;i++){
        System.out.println("Testing");
      }
    }
  }
}

Got an answer? Why don’t you leave it here.

Puzzle 7 – Add and Subtract

Language – Java | Type – Problem (Code) | Last date 18-Mar-2009 9:00 p.m. IST | Points 5

It’s easy to add up. Subtracting however is another ball game …

Write a program to subtract two floating point numbers.
Twist: Do not use the “-” (minus sign) in the entire program.

Got an answer? Why don’t you leave it here.

Puzzle 6 – Overloaded

Language – Java | Type – Concept | Last date 15-Mar-2009 12:00 p.m. IST | Points 2

Have you ever felt over loaded with work? Here is something to cheer you up …

package com.twisters;
class Base{}
public class Child extends Base{
       public boolean equals(Base b){
                   return false;
       }
       public static void main(String[] args) {
                   Base base;
                   Child child;
                   child = new Child();
                   base = child;
              
                   if(child.equals(base))
                               System.out.println("Child Equals Base");
              
                   if(base.equals(child))
                               System.out.println("Base Equals Child");
       }
}

Got an answer? Why don’t you leave it here.

Puzzle 5 – The Sign

Language – Java | Type – Concept | Last date 11-Mar-2009 9:00 p.m. IST | Points 2

Too many signs spoil the code …

package com.twisters;
public class Signs{
         public static void main(String[] args) {
                     int result;
                     int a = 5, b =1;
                     result = a---b;
                     System.out.println("Value of a is : " + a);
                     System.out.println("Value of b is : " + b);
                     System.out.println("Value of result is : " + result);
          }
}

Got an answer? Why don’t you leave it here.

Puzzle 4 – The Swap

Language – Java/C++ | Type – Problem (Code) | Last date 8-Mar-2009 12:00 p.m. IST | Points 5

Swapping can be easy, but this is the hardest swap ever!

Write a program that swaps two numbers.
Twist: Do not use “=” (equal sign) in entire program.

(Hard isn't it? )

Got an answer? Why don’t you leave it here.

Puzzle 3 – Inheritance

Language – Java | Type – Concept | Last date 4-Mar-2009 09:00 p.m. IST | Points 2

Inheritance can be fun, especially if you get loads of money. But then again Inheritance can be a big headache. Especially in Java, if you inherit more that you can chew…

package com.twisters;
class Base{
         public void baseCall(){
                     test();
         }
         public void test(){
                     System.out.println("Function Test in Base Executed");
         }
}

public class Child extends Base {
         public static void main(String[] args) {
                    Base baseRef = new Child ();
                     baseRef.baseCall();
         }
         public void test(){
                     System.out.println("Function Test in Child Executed");
         }
}

Got an answer? Why don’t you leave it here.

Puzzle 2 –Divide and (Multiply) Rule

Language – Java | Type – Concept | Last date 4-Mar-2009 9:00 p.m. IST | Points 2

I always considered myself to be good at algebra. I had no problems with equations, trigonometry and multiplication. But it takes Java to make simple algebra tricky. Do you know what this code does and why?

package com.twisters;
public class MulAndDiv {
       public static void main(String[] args) {
                   double result;
                   result = 2.0*2/4+2/4;
                   System.out.println("The result is : "+ result);
       }
}

Puzzle 1 – Hello World

Language – Java/C++ | Type – Problem (Code) | Last date 25-Feb-2009 9:00 p.m. IST | Points 5

Well here I was trying to write my first Java code. I was pretty excited. I started typing just to realize that the ‘W’ key on my keyboard wasn’t working. That’s when I had to write my Hello World code without a ‘W’. Do you think you can help me out with this?

Write a program to print “Hello World”.
Twist: Do not use the letter ‘W’ or ‘w’ in the source code.

Pretty simple stuff, but then it’s just the beginning of a long journey …