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• I am a beginner to C and this is the dumbest question..Confused about getchar() function

  - by happysoul

  Sorry if I am not supposed to post beginner level questions here..I am new to this site Please read the code below first I am confused about getchar() 's role in the following code.. I mean I know its helping me see the output window which will only be closed when I press enter key So getchar() is basically waiting for me to press enter and then reads a single character .. Now my question.. what is that single character this function is reading ?? I did not press any key from the keyboard for it to read Now when its not reading anything..why it does not give an error saying hey u didn't enter anything for me to read ..lol...(told u its a dumb question) #include <stdio.h> int main() { printf( "blah \n" ); getchar(); return 0; }

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• Noob question about a statement in a Java program

  - by happysoul

  I am beginner to java and was trying out this code puzzle from the book head first java which I solved as follows and got the output correct :D class DrumKit { boolean topHat=true; boolean snare=true; void playSnare() { System.out.println("bang bang ba-bang"); } void playTopHat() { System.out.println("ding ding da-ding"); } } public class DrumKitTestDriver { public static void main(String[] args) { DrumKit d =new DrumKit(); if(d.snare==true) { d.playSnare(); } d.playTopHat(); } } Output is :: bang bang ba-bang ding ding da-ding Now the problem is that in that code puzzle one code snippet is left that I did not include..it's as follows d.snare=false; Even though I did not write it , I got the output like the book. I am wondering why is there need for us to set it's value as false even when we know the code is gonna run without it too !?? I am wondering what the coder had in mind ..I mean what could be the possible future use and motive behind doing this ? I am sorry if it's a dumb question. I just wanna know why or why not to include that particular statement ? It's not like there's a loop or something that we need to come out of. Why is that statement there ?

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• How is Java Platform independent when it needs JVM to run ?

  - by happysoul

  Just started learning Java and I am confused about this whole independent platform thingy. Doesn't independent means that Java code should be able to run on any machine and would need no special software to be installed (JVM in this case has to be present in the machine)? Like, for example, we need to have Turbo C Compiler in order to compile C/C++ source code and then execute it.. The machine has to have the C compiler. guess I am confused..Somebody please explain in simple language or may be direct me to a tutorial that explain things in simple language ? that would be great I am just not getting the concept.

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• How can I improve my logical and analytical thinking skills so as to become an awesome programmer ?

  - by happysoul

  solve puzzles ? Solve programming problems ? what else ? Someone told me that I need begin with solving typical programs in C like those of factorial, recursion etc to improve logical thinking skills. What else do I do ? How do i go about it ? I am a beginner to programming.

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• Beginner Java Question about Integer.parseInt() and casting

  - by happysoul

  so when casting like in the statement below :- int randomNumber=(int) (Math.random()*5) it causes the random no. generated to get converted into an int.. Also there's this method I just came across Integer.parseInt() which does the same ! i.e return an integer Why two different ways to make a value an int ? Also I made a search and it says parseInt() takes string as an argument.. So does this mean that parseInt() is ONLY to convert String into integer ? What about this casting then (int) ?? Can we use this to convert a string to an int too ? sorry if it sounds like a dumb question..I am just confused and trying to understand Help ?

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• Should I learn about data structures & algorithms first or the programming language java first ?

  - by happysoul

  I am a beginner to programming. Should I like learn them side by side ? Now that I know DS and Algorithms form the basis of programming..Should I learn them first ? I am confused. What should be my learning path ? I want to be a really good Java programmer.

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• Java Beginner question about String[] args in the main method

  - by happysoul

  So I just tried excluding String[] args from the main method It compiled alright ! But JVM is showing an exception Why did it compile when String[] args HAS to be included every time ? What is going on here ? Why won't it show a compilation error ? typing this made me think that may be compiler did not see it as THE main method ..is that so ?

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• In Java why would one intialise an int variable with 0 when it will be assigned 0 only by default wh

  - by happysoul

  What purpose does it serve ? Just read an example in a book where the author has done so. int numOfGuesses=0;

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• Why does Java uses heap for memory allocation?

  - by happysoul

  I just read this statement in a java book saying Objects in java reside on a heap. Is a heap used because it is the best way to store data and retrieve data fast ? I only have an idea about data structures being a beginner. I mean why not stack or something else ?

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• What is an instance in Java ? Confused between instance and object

  - by happysoul

  Are they same ? Came across this line when reading about Java's main method's signature "String args[ ] declares a parameter named args, which is an array of instances of the class String. Objects of type String store character strings."

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• Java Beginner Question : What is wrong with the code below ?

  - by happysoul

  public class Function { public static void main(String args[]) { System.out.println(power(3,2)); System.out.println(power(3,2)); System.out.println(power(2)); } public long power(int m) { return m*m; } public long power(int m,int n) { long product=1; for(int i=1;i<=n;i++) { product=product*m; } return product; } } Compiler displays this error :- Function.java:5: non-static method power(int,int) cannot be referenced from a static context

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• Is it compulsory to learn about Data Structures if you want to be a Java/C++ programmer ?

  - by happysoul

  So do I like really need to learn about them ? Isn't there an interesting way to learn about stacks, linked lists, heaps ,etc ? I found it a boring subject. **While posting this question it showed some warning.Am I not allowed to post such a question ? Admins please clarify and I will delete it :/ Warning :: The question you're asking appears subjective and is likely to be closed.

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