What improvement has java-8 made that performance of HashMap.get() function call is fast by 20% in Java-8. Continue reading »
Aug 052017
May 132017
Generic programming, loosely means that the code we have written is type-independent. It is a larger topic, macros in C language also comes under generic programming. In this post we are only discussing generic pointers.
May 082017
How will you find minimum of three integers without using any comparison operator ?
Jul 252013
Write a class which will implement the Stack data structure in C++. Give the declaration & definition of the class. Also define the Node. For simplicity, you may assume stack to hold integer data type.
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May 202013
The below C++ code will print “Hello World”.
#include <iostream>
int main()
{
cout<<"Hello World";
}
Without modifying main function, add code to print “Ritambhara” before “Hello World”. You cannot add/remove any statement to main function
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May 192013
May 072013
What will be the output of the below C++ program:
// Template Function - Not taking class
template <class T, int i> int myFun(){
T x = 10;
i = 20;
}
int main(){
fun<int, 4>();
return 0;
}
Feb 062013
While comparing a variable with a constant (literal) in C/C++ language, which of the two ways of comparison should we use ?
if( x == 2 ) ...
if( ptr == NULL ) ...
Or
if( 2 == x ) ...
if( NULL == ptr ) ...
In the first comparison we are writing variable on the Left side of == and literal (constant) on right side. whereas, in the second form we are writing the literal (2, NULL, etc.) on the left side of ==.
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Feb 052013
Object of a class can be created dynamically on heap or statically on Stack or Data Area. If we have a class MyClass, then the below objects will be created on heap.
// Operator: New MyClass *ptr1 = new MyClass(); // Crating object of MyClass on heap. // Operator: New-Array MyClass *ptr2 = new MyClass[10]; // Create an array of object MyClass on heap.
However, objects can also be created statically as below:
// Global object created at load time in the data area
MyClass obj1;
void func()
{
// Object getting created on the Stack
// (Activation record of function func).
MyClass obj2;
// Global object created at load time in the data area
static MyClass obj3;
}
Design a class which does not allow any object to be created on heap.
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Feb 052013
Write a class, such that user can create its object on heap (using new) but user should not be able to create its object on stack or data area. i.e if the class is MyClass, then
MyClass stackObj; // Should give compile time error. MyClass *heapobj = new MyClass; // This should be OK, & allowed.
Give the definition of class, MyClass (How should you change the scope or anything else of constructor / destructor / assignment operator or any other function, etc.). Continue reading »