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Primary Insider is a collection of articles on different topics and programming languages for student programmer such as C, C++, Java, Tech News and other topics.


/ 5 min read

TextView and EditText in Android

1. How to use simple TextView in android Write this code in .xml file <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools&



/ 2 min read

How to pass Command Line Arguments in Turbo C++

The following are the steps to execute a program with Command Line Argument inside Turbo C/C++ Compiler : 1. Open Turbo C++ Open Turbo C++. If you don't have, you can download Turbo C++ from here. 2. Write a program Following is a simple example


/ 2 min read

What is Dangling Pointer with Cause and How to avoid it?

Dangling pointers in computer programming are pointers that pointing to a memory location that has been deleted (or freed). Dangling pointers arise during object destruction, when an object that has an incoming reference is deleted or deallocated, without modifying the value of the pointer, so


/ 8 min read

Big-O Notation Explained with Examples

Asymptotic notation is a set of languages which allow us to express the performance of our algorithms in relation to their input. Big O notation is used in Computer Science to describe the performance or complexity of an algorithm. Big O specifically describes the worst-case



/ 2 min read

Why does the indexing of Array start with Zero in C?

Martin Richards, creator of the BCPL language (a precursor of C), designed arrays initiating at 0 as the natural position to start accessing the array contents in the language, since the value of a pointer p used as an address accesses the position p+0


/ 5 min read

Mathematics and number based challenges

The programming ideas/challenges featured here can be programmed in popular programming languages like C, C++, C#, Java, Go, Python, Ruby, JavaScript and PHP for either the Web, MacOS, Windows PC, Android, Windows Phone or iOS. Just fire up your favourite IDE, begin work on


/ 3 min read

Memory Layout / Representation of C Program

Memory layout / representation of C program is organized in following fashion - Text or Code segment Initialized data segment Uninitialized data segment Stack Heap 1. Text or Code Segment Text segment contains machine code of the compiled program. Usually, the text segment is shareable so


/ 1 min read

What is Digraphs, Trigraphs and Tokens? - C/C++ Programming Language

In computer programming, digraphs and trigraphs are sequences of two and three characters, respectively, that appear in source code and, according to a programming language specification, should be treated as if they were single characters. Why Digraphs and Trigraphs exist? Various reasons exist for using


/ 4 min read

Storage Classes in C Programming Language

Storage class specifiers are the keywords which can appear next to the top-level type of a declaration. The use of these keywords affects the storage duration and linkage of the declared object, depending on whether it is declared at file scope or at block scope:


/ 3 min read

An Untold Story of Storage Class in C Programming Language

Storage class specifiers are the keywords which can appear next to the top-level type of a declaration. The use of these keywords affects the storage duration and linkage of the declared object, depending on whether it is declared at file scope or at block scope:


/ 3 min read

Simple and Static Assertion (assert) in C Programming Language

An assertion is a statement used to assert that a fact must be true when that line of code is reached. Assertions are useful for ensuring that expected conditions are met. 1. Simple Assertion Simple assertion can be implemented using assert(expression) method of assert.


/ 7 min read

11 Most Common Pitfalls in C Programming Language

1. Mixing signed and unsigned integers in arithmetic operations It is usually not a good idea to mix signed and unsigned integers in arithmetic operations. For example, what will be output of following example? #include <stdio.h> int main(void) { unsigned int a

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