What is token c programming

Feb 5, 20175 likes2,616 views

Tokens are the basic building blocks of C language that are combined to write C programs. There are six types of tokens: keywords, identifiers, constants, strings, special symbols, and operators. A C program consists of various tokens, where a token can be a keyword, identifier, constant, string literal, special symbol, or operator. For example, the statement "printf("welcome here\n");" contains five tokens - printf, (, "welcome here\n", ), and ;.

What is Token
C tokens are the basic buildings blocks in C language which are
constructed together to write a C program.
Each and every smallest individual units in a C program are
known as C tokens

Types of Token
In C Programming tokens are of six types.
They are,
I. Keywords (ex: int, while,float),
II. Identifiers (ex: sum, total),
III. Constants (ex: 10, 20),
IV. Strings (ex: “ram”, “hello”),
V. Special symbols (ex: (), {}),
VI. Operators (ex: +, /,-,*)

C TOKENS EXAMPLE PROGRAM
#include<stdio.h>
void main()
{
int x, y, sum;
x = 6, y = 6;
sum = x + y;
printf ("Total = %d n", sum);
}
main – identifier
{,}, (,) – delimiter
int – keyword
x, y, sum – identifier
main, {, }, (, ), int, x, y, sum –
tokens
output
Total = 12
Press any key to continue . . .

Conclusion
That means C program consists of various tokens and a token is either a keyword, an
identifier, a constant, a string literal, Special symbols or a operator. For example, the
following C statement consists of five tokens
printf(“welcome heren”);
The individual tokens are −
printf
(
“welcome heren”
)
;

Token Examples
No Token Type Example 1 Example 2
1 Keyword do while
2 Constants number sum
3 Identifier -66 69
4 String “Hello” “Prem”
5
Special
Symbol
(), {} @
6 Operators ++ /

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The document discusses a simple "Hello World" C program. It includes the source code, which prints "Hello World" using the printf function. It explains that a C program consists of preprocessor commands, comments, functions, variables, and statements/expressions. It then breaks down the parts of the "Hello World" program, noting that #include is a preprocessor command that includes the stdio.h header file, main is the starting function, /*...*/ are comments, printf is a function that displays the message, and return 0 terminates main and returns a value of 0.

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Identifiers are names given to variables, functions, and other user-defined items in a program to uniquely identify them. Identifiers must be different from keywords and other identifiers. They can include letters, digits, and underscores but must begin with a letter or underscore. Common examples of identifiers are variable and function names like roll_no and average. Identifiers are case-sensitive and allow programmers to reference specific program elements like variables during execution.

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Type casting is converting a variable from one data type to another. It is done explicitly using a cast operator like (type_name). It is best to cast to a higher data type to avoid data loss as casting to a lower type may truncate the value. There are two types of casting in C - implicit casting which happens automatically during assignment, and explicit casting which requires a cast operator. Implicit casting is done when assigning a value to a compatible type while explicit casting is needed when types are incompatible.

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The document provides information on strings in C programming language. It discusses that strings are arrays of characters terminated by a null character. It shows examples of declaring and initializing strings, reading strings from users, and printing strings. It also provides examples of using standard string functions like strcpy(), strcat(), strlen() etc. Further examples demonstrate finding frequency of characters in a string, counting vowels, consonants, digits and whitespaces, and removing non-alphabet characters from a string.

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The document contains 5 code snippets demonstrating the use of various C functions: 1) A program that calculates the sum of 1/n from n=1 to 10 using a cast to convert n to a float. 2) A program that gets a single character input and prints a message based on the input. 3) A program that tests if a character is a letter, digit or other character using isalpha and isdigit functions. 4) A program that converts a character to uppercase if lowercase and vice versa using islower, toupper, tolower. 5) A program that converts a character to lowercase if uppercase and vice versa using isupper, tolower, toupper.

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The document discusses arrays in C programming. It explains that arrays consist of contiguous memory locations and how to declare and initialize one-dimensional and multi-dimensional arrays. It provides examples of accessing array elements, finding the sum and transpose of 2D arrays, and multiplying two matrices using nested for loops. The document is a reference for working with different types of arrays through examples of common array operations in C.

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The document discusses functions in C programming. It defines a function as a block of code that performs a specific task. Some key points: - Functions allow breaking a program into smaller and reusable parts. The main() function is required in every C program. - Functions are declared with a return type, name, and parameters. They are defined with a block of code enclosed in curly braces. - Functions can be called from other functions and can call themselves recursively. However, a function cannot be defined within another function. - By default, C uses call-by-value to pass arguments to functions. This means changes to parameters do not affect the original arguments. Call-by-reference uses

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Loops allow code to be executed repeatedly. The main loop types are while, for, and do-while loops. While and do-while loops test the condition at the beginning or end of the loop respectively. For loops allow code to be executed a specific number of times. Loops can be nested by placing one loop inside another. Break and continue statements control the flow of loops. Break exits the current loop while continue skips to the next iteration. Though goto can provide unconditional jumps, its use is discouraged due to reducing code readability.

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The document discusses different types of operators in C programming language including arithmetic, relational, logical, bitwise, and assignment operators. It provides examples of each operator and their functions. Arithmetic operators are used to perform mathematical calculations. Relational operators compare values. Logical operators combine conditional statements. Bitwise operators work at the bit level on binary representations of numbers. Assignment operators assign values from right operands to left operands.

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What is token c programming

1. What is Token

2. What is Token C tokens are the basic buildings blocks in C language which are constructed together to write a C program. Each and every smallest individual units in a C program are known as C tokens

3. Types of Token In C Programming tokens are of six types. They are, I. Keywords (ex: int, while,float), II. Identifiers (ex: sum, total), III. Constants (ex: 10, 20), IV. Strings (ex: “ram”, “hello”), V. Special symbols (ex: (), {}), VI. Operators (ex: +, /,-,*)

4. C TOKENS EXAMPLE PROGRAM #include<stdio.h> void main() { int x, y, sum; x = 6, y = 6; sum = x + y; printf ("Total = %d n", sum); } main – identifier {,}, (,) – delimiter int – keyword x, y, sum – identifier main, {, }, (, ), int, x, y, sum – tokens output Total = 12 Press any key to continue . . .

5. Conclusion That means C program consists of various tokens and a token is either a keyword, an identifier, a constant, a string literal, Special symbols or a operator. For example, the following C statement consists of five tokens printf(“welcome heren”); The individual tokens are − printf ( “welcome heren” ) ;

6. Token Examples No Token Type Example 1 Example 2 1 Keyword do while 2 Constants number sum 3 Identifier -66 69 4 String “Hello” “Prem” 5 Special Symbol (), {} @ 6 Operators ++ /

7. Thank You

What is token c programming

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