C Basic Syntax

Comments in C programming language

Comments are used to explain C code. Comments are also used to prevent the execution of code while testing. Comment lines are ignored by the compiler. In C programming language there are two types of comment,

• Single line comment
• Multi-line comment

Single line comment

The single-line comment is used to comment a single line of code in a C program. Single line comment starts with two forward slashes(//). This type of comment is used at the end of a code line and we cannot use it within a code line.

#include <stdio.h>

int main() //This is the main function
{
    printf("Hello Neural Beast"); //This is a printing statement
    return 0; //This is a return statement
}

Multi-line comment

Multi-line comments are used to comment more than one line in C program. Multi-line comment starts with /* and ends with */ . Everything between these character combinations are ignored by the compiler.

#include <stdio.h>

int main()
{
    printf("Hello Neural Beast");
    /*
    This is an Example
    for multi-line
    comment
    */
    return 0;
}

Tokens in C programing language

A Token is the smallest unit or basic building block of a C program. A program contains various tokens such as keyword, string literal, identifier, or a symbol. The compiler breaks the C program into smaller units called tokens and sends it to various stages of the compiler to process.

{
printf("Hello Neural Beast");
}

The individual tokens are,

{
printf
(
"Hello Neural Beast"
);
}

Identifiers in C programming language

Identifiers represent a name used to identify a function, array, variable, unions, etc in C programming language. An identifier can contain letters such as uppercase and lowercase, numbers from 0-9, and underscore. An identifier should not contain symbols such as @, #, $, and %. The First character of an identifier should be a alphabet or underscore.

Note: In C programming language Identifiers are case-sensitive, Neural and neural are two different identifiers.

#include<stdio.h>

int main()
{
    int Num_1, Num_2, sum = 0;
    Num_1 = 10;
    Num_2 = 20;
    sum = Num_1 + Num_2;
    printf("Sum of the value is: %d", sum);
    return 0;
}

Keywords in C programming language

Keywords have special meaning to the language compiler. Keywords are reserved words and keywords cannot be used as a variable name or constants or other identifier names. In C programming language there are 32 reserved keywords. The keywords should be written in lower case. C keywords cannot be used as a variable name because keywords are assigned with fixed meaning.

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

White-space in C programming language

C programming language allows white-space, i.e, Tabs, blank lines, spaces, etc. In C white-space are ignored by the compiler.

#include <stdio.h>

int
main()
{

    printf

    ("Hello Neural Beast");
    return 0;
}