How to Install and Configure MongoDB in Ubuntu?
MongoDB is an open-source document oriented NoSQL database which is written in C++. MongoDB is schema-less database system and hence its very easy to add… Read More »
Category Archives: GFacts
Interesting Facts About Perl
Perl is a general-purpose, high level interpreted and dynamic programming language. It was developed by Larry Wall, in 1987. There is no official Full form… Read More »
10 Interesting Facts About Computers
Computers have changed our lives in unimaginable ways. They have made our lives so much easier. Here are 10 scintillating facts about computers: The first… Read More »
Interesting Facts about DBMS
The amount of information we are surrounded with is literally exploding every single day and there is an immediate need to organise all these data.… Read More »
Can C++ reference member be declared without being initialized with declaration?
To many readers, this might sound the same thing, i.e. class_type *var = NULL; *var = &some_work; is same as class_type *var = &some_work; But… Read More »
Facts and Question related to Style of writing programs in C/C++
Here are some questions related to Style of writing C programs: Question-1: Why i++ executes faster than i + 1 ? Answer-1: The expression i++… Read More »
Dilworth’s Theorem
Let S be a finite partially ordered set. The size of a maximal antichain equals the size of a minimal chain cover of S. This… Read More »
Storage of integer and character values in C
Integer and character variables are used so often in the programs, but how these values are actually stored in C are known to few. Below… Read More »
Vantieghems Theorem for Primality Test
Vantieghems Theorem is a necessary and sufficient condition for a number to be prime. It states that for a natural number n to be prime,… Read More »
Cauchy’s Mean Value Theorem
Suppose f(x) and g(x) are 2 functions satisfying three conditions: 1) f(x), g(x) are continuous in the closed interval a <= x <= b 2)… Read More »
Nesbitt’s Inequality
Nesbitt’s inequality is one of the simplest inequalities in mathematics. According to the statement of the inequality, for any 3 given real numbers they satisfy… Read More »
GFact 23 | (Brocard’s problem)
Brocard’s problem is to find values of m and n such that n!+1 = m2 For example, a pair (4, 5) solves the above equation.… Read More »
GFact 22 | (2^x + 1 and Prime)
A number of the form 2x + 1 (where x > 0) is prime if and only if x is a power of 2, i.e.,… Read More »
G-Fact 21 | Collatz Sequence
Starting with any positive integer N, we define the Collatz sequence corresponding to N as the numbers formed by the following operations: N → N/2… Read More »
G-Fact 20 (Cayley’s formula for Number of Labelled Trees)
Consider below questions. How many spanning trees can be there in a complete graph with n vertices? How many labelled Trees (please note trees, not… Read More »
