Site Archive

Primary 1 min read

How to break a output line in C++

The cout operator does not insert a line break at the end of the output. One way to print two lines is to use the endl manipulator, which

Primary 2 min read

Introduction to C++

C++ is a statically typed,general purpose programming language. C++ was derived C, band is largely based on it. Note: A programming language is said to used static

Primary 1 min read

Difference between C and Ansi C

Main difference: C was originally developed by Dennis Ritchie at AT&T Bell Labs between 1969 and 1973. It has a free-format program source code. C

News 1 min read

Your iOS App Has To Be IPv6 Ready before 1st June.

At WWDC 2015 Apple announced the transition to IPv6-only network services in iOS 9. Starting June 1, 2016 all apps submitted to the App Store must support

Primary 1 min read

What does the C ??!??! operator do?

??! is a trigraph that translates to |. So it says: if(a || b){ ... }else{ ... } So, what is digraphs and trigraphs? In computer programming, digraphs and trigraphs are sequences of

Primary 1 min read

Why in C language is it the case that a[5] == 5[a]?

The C standard defines the Array Subscript Operator [] as follows: a[b] == *(a + b) Therefore a[5] will evaluate to: *(a + 5) and 5[a] will evaluate to:

Primary 1 min read

Why isn't sizeof for a struct equal to the sum of sizeof of each member?

This is because of padding added to satisfy alignment constraints. Data structure alignment impacts both performance and correctness of programs. Here's an example using typical settings

Primary 2 min read

Why is one loop so much slower than two loops?

Suppose a1, b1, c1, and d1 point to heap memory and code has the following loop. const int n=100000; for(int j=0;j<n;j+

Primary 3 min read

Why is processing a sorted array faster than an unsorted array?

Here is a piece of Visual C++ code that seems very peculiar. For some strange reason, sorting the data miraculously makes the code almost six times faster. #include

Primary 1 min read

What is the difference between #include <filename> and #include “filename”?

The difference is in the location where the preprocessor searches for the included file. For #include "filename" the preprocessor searches in the same directory as the

Primary 2 min read

What are the differences between a pointer variable and a reference variable?

* A pointer can be re-assigned: int x = 5; int y = 6; int *p; p = &x; p = &y; *p = 10; assert(x == 5); assert(y == 10)

Primary 1 min read

What is the name of the "-->" operator?

Here's an example: #include <stdio.h> int main() { int x = 10; while( x --> 0 ) // x goes to 0 { printf("%d ", x)

News 1 min read

Windows 10 Free Upgrade Offer to End Soon

The free upgrade offer to Windows 10 was a first for Microsoft, helping people upgrade faster than ever before. And time is running out. The free upgrade offer

Swift 2 min read

Introduction to Swift - Swift Programming Language

Swift is a new programming language for iOS, OS X, watchOS, and tvOS apps that builds on the best of C and Objective-C, without the constraints of

Swift 2 min read

Download Swift for Windows

Swift is a general-purpose, multi-paradigm, compiled programming language created for iOS, OS X, watchOS, tvOS and Linux development by Apple Inc. Update - 22 SEPTEMBER 2020 From