Difference between C and C++ programmming language.

Difference between C and C++ programmming language.

  March 19, 2022    Digital Scroller

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Difference Between C and C ++ programming language.

C Programming language

C was developed by Dennis Ritchie between the year 1969 and 1973 at AT&T Bell Labs.

C is a subset of C++. C contains 32 keywords. C++ contains 63 keywords.

For the development of code, C supports procedural programming. Functions in C are not defined inside structures. Namespace features are not present inside the C.Header file used by C is stdio.h. Virtual and friend functions are not supported by C.

C ++ Programming language

C++ was developed by Bjarne Stroustrup in 1979.

C++ is a superset of C . C++ is known as a hybrid language because C++ supports both procedural and object-oriented programming paradigms.C++ is an object-driven language. C++ focuses on data instead of focusing on method or procedure. C++ structures have access modifiers.C++ provides a new operator for memory allocation and a delete operator for memory de-allocation. Functions can be used inside a structure in C++. Namespace is used by C++, which avoids name collisions.

C is a very simple language actually, lacking many features found in newer languages. With C, there is no hand-holding, and most things have to be done manually. The standard library is very limited by modern standards. C is quite close to the hardware, which is actually its best feature. Being simple and close to the hardware is probably the main reason for C's continued success and popularity.

On the other hand, C++ is one of the more complex languages, which means it can take a long time to truly master. It evolved out of C, and therefore includes everything which was already in C. But, many C-style techniques are generally discouraged in C++. This combined with the fact that C++ is still evolving (C++11, 14) means that to master C++ you need to understand the history of the language and the advantages/disadvantages of different techniques. With C++ you can write high-performance, high-quality modular software. But there are many many pitfalls along the way, especially for those coming from a background of more forgiving languages (Java, C#, JavaScript, Python, etc.).

Most people don't realize that C++ can often produce even faster natively-compiled software than plain C. This is because of the template system and the ability to do extra work at compile time (for example, plain C's qsort is usually much slower than C++'s std::sort because of function pointers [C] vs. inlining [C++]). On the plus side, if you really master C++ most other languages will seem like a piece of cake by comparison.

C is a language invented between 1969–1973 along with the Unix OS, which was written in it. C++ was invented in 1979 and standardized in 1998, and it's basically a massive upgrade of C, but it's not C, it's something totally different altogether. Almost all code written in C will also compile perfectly as C++ code, since C++ is a strict superset of C, meaning it only adds features and doesn't remove or change anything (thus breaking compatibility).

Some of the additions are:

• Classes, the main new feature. Basically structs with function members, inheritance, and access specifiers. In C++, structs are almost synonyms with classes, except they have public members and inheritance by default.

• Namespaces, is also a big addition. In C, every function goes to a global namespace, which made name clashes common. Let's say you have included <unistd.h>: POSIX names are stupidly and dangerously generic, so you can't create a function called, for example, “open”.

• Function overloading is also a big addition. C++ uses name mangling to store the function's name, which is used to differentiate functions of different parameter types.

• Operator overloading, I wasn't kidding when I said it's massive, still a big addition, allows you to define custom behaviors for operations on classes. Syntax sugar, but welcome.

• Lambdas (C++11 and up), an amendment for the fact neither C nor C++ have first-class functions. Basically, functions that can be defined inline, stored on a variable, passed around, and called.

• Using statement, both a replacement for typedef and a way to use a namespace without typing its name all the time.

• Constexpr variables and functions, are evaluated at compile-time, and can replace the preprocessor at times (but not always).

C and C++ are not the same there is a lot of difference between C and C++ languages.

• C is a structural or procedural-oriented programming language but C++ is a partially object-oriented programming language.

• In C++, We can use STL(Standard Template Library) to implement most of the Algorithms and Data Structures but in C we have to manually code everything.

• In C++, there is a concept called the “Inline” function. The inline function execution is faster than the normal function. C doesn’t have the inline function concept.

• In C++, We have the “Vectors” dynamically grow-able array but that is not possible in the c programming language.

• We can implement all the C Programming concepts in C++ but vice versa is not possible.

• In C++ by using the friend function we can access the private members of the class but there is no concept of classes in C++.

• As C++ supports object-orientated programming we can implement Polymorphism, Inheritance, Abstraction, and Encapsulation but these are not possible in C language.

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C Programming - Tutorial

C Programming - Tutorial

  January 20, 2022    Digital Scroller

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What is Programming?

Computer programming is a medium for us to communicate with computers, just like we use Hindi or English to communicate with each other. Programming is a way for us to deliver our instructions to the computer

What is C programming?

C is a programming language. C is one of the oldest and finest programming languages. C was developed by Dennis Ritchie in 1972.

Uses of C

C is a language that is used to program a wide variety of systems. Some of the uses of C are as follows:

Major parts of Windows, Linux, and other operating systems are written in C.
C is used to write driver programs for devices like Tablets, Printers, etc.
C language is used to program embedded systems where programs need to run faster in limited memory.
C is used to develop games, an area where latency is very important, i.e., a computer has to react quickly to user input.

Chapter 1: Variables, Constants, and Keywords:

Variables

A variable is a container that stores a ‘value.’ In the kitchen, we have containers storing rice, dal, sugar, etc. Similar to that variable in c stores the value of a constant. Example:

a = 3	a is assigned “3”
b = 4.7	b is assigned “4.7”
c = 'A'	c is assigned “A”

Rules for naming variables in C :

1. The first character must be an alphabet or underscore(_).

2. No commas or blanks are allowed.

3. No special symbol other than underscore is allowed

4. Variable names are case sensitive

Constants

An entity whose value doesn’t change is called a constant.
Types of constant

Primarily there are 3 types of constant:

1. Integer Constant	-1,6,7,9
2. Real Constant	-322.1,2.5,7.0
3. Character Constant	‘a’,’$’,’@’(must be enclosed within single inverted commas)

Keywords

These are reserved words whose meaning is already known to the compiler. There are 32 keywords available in C programming:

auto	double	int	struct
break	long	else	switch
case	return	enum	typedef
char	register	extern	union
const	short	float	unsigned
continue	signed	for	void
default	sizeof	goto	volatile
do	static	if	while

Our first C program

#include<stdio.h>

int main() {

printf(“Hello World”);
return 0;

}

File : first.c

The basic structure of a C program

All c programs have to follow a basic structure. A c program starts with the main function and executes instructions presents inside it. Each instruction terminated with a semicolon(;)

There are some basic rules which are applicable to all the c programs:

1. Every program's execution starts from the main function.
2. All the statements are terminated with a semi-colon.
3. Instructions are case-sensitive.
4. Instructions are executed in the same order in which they are written.

Comments

Comments are used to clarify something about the program in plain language. It is a way for us to add notes to our program. There are two types of comments in c:

1. Single line comment: //This is a comment.
2. Multi-line comment : /*This is multi-line comment*/

Note: Comments in a C program are not executed and ignored.

Compilation and execution

A compiler is a computer program that converts a c program into machine language so that it can be easily understood by the computer.

A program is written in plain text. This plain text is a combination of instructions in a particular sequence. The compiler performs some basic checks and finally converts the program into an executable.

Library functions

C language has a lot of valuable library functions which is used to carry out a certain task; for instance, printf function is used to print values on the screen.

Types of variables

Integer variables	int a=3;
Real variables	int a=7.7 (wrong as 7.7 is real) ; float a=7.7;
Character variables	char a=’B’;

Chapter 2: Instructions and Operators:

A C-program is a set of instructions. Just like a recipe - which contains instructions to prepare a particular dish.

Types of instructions in C:

1. Type declaration instruction
2. Arithmetic instruction
3. Control instruction

Type of declaration instruction:

int a;
float b;

other variations:

int i = 10; int j = i, int a = 2;
int j1 = a + j - i;

float b = a+3; float a = 1.1;    ==>Error! As we are trying to use a before defining it. 

int a,b,c,d;

a=b=c=d=30;                      ==> Value of a,b,c & d will be 30 each. 

Arithmetic Instructions

Note:

1.No operator is assumed to be present

int i=ab ( Invalid )

int i=a*b ( valid )

2. There is no operator to perform exponentiation in c however we can use pow(x,y) from <math.h> (More in next chapter).

Type conversion

An Arithmetic operation between

int and int     ==> int
int and float   ==> float
float and float ==> float

5/2 --> 2               5.0/2 --> 2.5 //IMPORTANT!!
2/5 --> 0               2.0/5 --> 0.4 //IMPORTANT!!

NOTE:
int a = 3.5; //In this case, 3.5 (float) will be denoted to a 3 (int) because a cannot store floats.

float a = 8; // a will store 8.0 [8-->8.0(Promotion to float)]

Quick Quiz:

Question - int k=3.0/9 value of k? and why?

Solution - 3.0/9=0.333, but since k is an int, it cannot store floats & value 0.33 is demoted to 0.

Operator Precedence in C

3*x-8y is (3x)-(8y) or 3(x-8y)?

In the c language, simple mathematical rules like BODMAS no longer apply.

The answer to the above question is provided by operator precedence & associativity.

Operator precedence

The following table list the operator priority in C.

Priority	Operators
1st	* / %
2nd	+   -
3rd	=

Operators of higher priority are evaluated first in the absence of parenthesis.

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