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;
}
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