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How do you write a program which produces its own source code as its output?
praveensaini23
- Jun 28th, 2010
#include <stdio.h>int main(){char ch;FILE *file;file=fopen("printitself.c","r");while((ch=fgetc(file))!=EOF)printf("%c",ch);return 0;}
Manoj
- Mar 14th, 2007
All the solutions above are reading the source code with the files concepts.find a solution where you do not have a source file to read the contents.There is a macro or an attiribute which tells the c...
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Explain the Encapsulation principle
Encapsulation is a process of binding or wrapping the data and the codes that operates on the data into a single entity. This keeps the data safe from outside interface and misuse. One way to think about encapsulation is as a protective wrapper that prevents code and data from being arbitrarily accessed by other code defined outside the wrapper.
srinathbairu
- Jun 24th, 2010
Every program deals with two elements:1) Data 2) Code [function]Combining these two elements into a single unit is known as Encapsulation (Binding).
dkapadia
- Sep 5th, 2008
Encapsulation with a simple example would be .Automatic Transmission on an automobile. It encapsulates 100's of bits of information about your engine, such as how much are accelerating, the pitch ...
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Abstract Classes
What is the main use of abstract classes?
nmohan
- Jun 21st, 2010
If you are coding for 100 classes in which some function (name or functionality may be both) will be same then you have two option first is to code same function 100 times in different 100 class secon...
saurabhfri
- Mar 25th, 2010
If you are coding for 100 classes in which some function (name or functionality, may be both) will be same then you have two option first is to code same function 10...
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Explicit Constructor
What is Explicit Constructor?
clipspiker
- Jun 4th, 2010
Java objects extend Object class and hence inherit a default constructor. Thus every class can be instantiated using the default constructor. This is made possible by constructor chaining. However, it...
cordialamit
- Mar 6th, 2010
Explicit constructor is actually a parameterized constructor which takes some parameters in order to create instance of a class.E.g. Class Sample &...
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Is class an Object? Is object a class?
beekal
- May 25th, 2010
A Person is a class and You and me are two objects of Class Person. We can create hundreds and thousands objects of the class and those hundreds and thousands objects still would be uniquely dif...
sfjadi2010
- Apr 11th, 2010
In my last interview, the interviewer ask me a question which is similar this one. No, class is not an Object or Object is not a class, we just say that Class is a prototype to creates objects. First we need a prototype then we have object, wihtout prototype or class object cannot be exist.
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How do you differentiate a constructor from a ordinary function?
shamli85
- Apr 2nd, 2010
1. Constructor always has its Class name.2. No return types3. can't be final or static
Ashwani Kabra
- Mar 21st, 2007
There are three differences. 1. In Java constructor has its class name. that can be unique. In .NET it has "NEW" by name. 2.It does not have any return type. 3. It cannot be subclass.
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Java Polymorphism
Describe why Java supports only runtime polymorphism?
kapilghodawat
- Mar 25th, 2010
Real polymorphism has to be at run time. Think of this scenario, Java has exposed JDBC drivers interface and you load the driver class at runtime. Using the same code you can connect to any JDBC compl...
tarun23
- Nov 1st, 2009
The three ways of polymorphism in Java are method overloading, method overridding and method overridding by extending an class. All these results come true when we run our class which is overloading o...
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Print Data from Array Index
How do you print data from an arry index by stating the position as the output in the C program?
krishnateja
- Feb 24th, 2010
A simple for loop as described bellow is sufficient for (i=0;i<n;i++) printf("the element in %d is %d",i,a[i]);i is defined and n is the array size
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Priority Level
What do you mean by priority level in features of OOPS?
rupesh.sahay53
- Jan 23rd, 2010
In thread we can set 5 types of priority1. Normal2. Max3. Min4. Above normal5. Below normal
kenpachi
- Apr 22nd, 2009
There are three priority levels for a thread i.e which thread has to access the resource first or second when two or more thread try to access the same resource at same time.max_priority 10norm_priority 5 (default)min_priority 1
Priority level can vary from 1 to 10 -
Classes and Objects
What is the relationship Between Classes and Objects?
amarkartu
- Dec 23rd, 2009
Class:1. Is a logical construct which defines the shape and nature of an object.2. Is a Template for an object.Object:1. Is a real time entity.2. Is a instance of class.
Mrinal Srivastava
- Sep 8th, 2009
The relationship between Classes and Objects can be defined in the easy way as The relationship between Maruti and a particular Maruti 800 DL 12 H 2343, implies when we talk about Maruti it gives us s...
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Out of fgets() and gets() which function is safe to use and why?
subashrivasudevan
- Dec 16th, 2009
Fgets() is safer as it does bounds checking. scanf & gets dont do so
Ajay K
- Jul 1st, 2007
gets does NOT check the size of the buffer and overflow on the stack can occour. Because of this, you should use fgets in preferance.
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Diffrence between a "assignment operator" and a "copy constructor"
a_l_soni
- Dec 8th, 2009
When a Class is created there are five methods that are, by-default, created by the compiler for that class. They are: 1. Default no argument constructor. 2. Default Destructor. 3. De...
ankurgarg
- Feb 21st, 2008
In C++, assignment and copy construction are different because the copy constructor initializes uninitialized memory, whereas assignment starts with an existing initialized object. If your class conta...
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Does C also supports abstraction
Abstraction is defined as hiding details from the end user who should be in no way concerned about the details of the internal mechanism on implementation...but then the same can be achieved in C also , i can use functions, and can comfortably be unaware of theinternal complications of the same, so can i say C also supports abstraction??
shanthankumar
- Dec 4th, 2009
No, though C supports structures, but the variables are public. hence it doesnt.
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What is the difference between Strings and Arrays?
KishoreKNP
- Dec 4th, 2009
String is nothing but charatcer array, There are some special featues(functions like strupr, strlen etc) available for strings as compared with Arrays.
raj
- Apr 26th, 2006
Strings always ends with a NULL (\0) character but not array
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What are the different storage classes in C?
supriya ahire
- Mar 24th, 2006
Storage classes in c are : Auto ,Extern,Static,Register,Volatile.
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What will happen if I allocate memory using "new" and free it using "free" or allocate sing "calloc" and free it using "delete"?
KishoreKNP
- Dec 4th, 2009
new and freeWhen you use new operator for allocating the memory, it calls constructor by default, and when free the memory using "free" function, it won't call destructor of the class.so...
zdmytriv
- Jan 24th, 2008
1. new and free - no constructor was called so you can get blocked memory(memory leak), but no error2. calloc and delete - delete can be called to the object of the class, so you'll get and error
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Difference between "printf" and "sprintf".
KishoreKNP
- Dec 4th, 2009
Printf and sprintf both will do the same work, but printf outputs on stdout(moniter) where as sprintf() printf the output in a string
vmshenoy
- Jan 9th, 2007
printf is the standart function in (c) programming language library for printing formatted output.egprintf writes the resulting string to the standard output(remember, Awk has...
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}">
Could any one explan me what happens in this program. main(){ int i=10; i=(++i)/(i++); printf("i=%d",i); }
KishoreKNP
- Dec 2nd, 2009
The answer is 2, because the statementi = (++i) / (i++)will be processed from left to righti = (++10) / (10++)which meansi = 11/10++Here still ++ operator is not executedi = 1++; // 1 because it is an integer operationi = 2;if you changei = (++i) / (++i) you will see 1
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What is the use of destructor?Can any explain me deep using program?
KishoreKNP
- Dec 2nd, 2009
Destructor is a special member function of a class, which is called automatically by the compiler when the object is getting destroyed. In general we write the code here to cleanup the resources that ...
kavitha
- Jul 26th, 2006
desturctor is to destory objects.this is denoted by '~'.for eg:class alpha{public:read(int);disp();~alpha();};void alpha::read(){cout<<"Enter i":cin>>i;}void alpha::~alpha(int i){i--;cout<<i;}
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else
printf("b<.7 and a>=.5");
else
printf("b>=.7");
}">Output and why?main(){ float a=.5,b=.7; if(b
KishoreKNP
- Dec 2nd, 2009
Each and every float constant in C/C++ treated as double, because of this this program won't work as you expected. Add "f" like ".7f" after every float constant then it works as you expected.
Akash
- Feb 6th, 2007
The output of the above programme will be b=0.5 .7 is not stored as 0.7 ie it is stired to some value which is slightly less that 0.7 so the control will not work as expected [this is the only excception i guess for floating point nos]
OOPS Interview Questions
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