Simply put, a token and a field are two different things, though you will often see them confused. Most of what is on this page concerns fields. tokens Tokens relate to lexing and parsing, where the text being decoded is an ordered list of tokens, not necessarily all of the same type. A token is typically a string of characters that possess some common characteristic, such as being all alphabetic, or being a specific list of characters, like "->" and "<<". Tokens also have semantic value (or meaning) attached to them. (Fields do not.) For example, in C++, the text string s = "Hello world!"; contains five tokens: string a type s an identifier = an operator"Hello world!" a constant string literal ; a statement terminator It is worth noting here that for the C++ example each token has different characteristics and whitespace is treated specially. This kind of tokenizing requires careful lexing; typically token-specific functions are used to determine whether or not a character belongs to the current token and to classify the token’s type. fields A field is typically a string of characters that do not include a set of special characters called delimiters. An ordered collection of fields, separated by delimiters, is called a record. A collection of records is called, variously: databases, tables, spreadsheets, etc. Depending on your requirements specifications, it may be possible for some fields to include characters that would normally be considered delimiters; the characters are in some way encoded into the field to prevent them from being understood as delimiters. For example, here is a record of six fields, delimited by commas and quoted by double-quote characters, where (unquoted) leading and trailing whitespace is ignored:Nalleli Andrade, 12 Jun 1989,,"piña colada, long walks in the rain" ,ID 1589-73AYN, The six fields are, in order: 1 Nalleli Andrade 2 12 Jun 1989 3 4 piña colada, long walks in the rain 5 ID 1589-73AYN 6 One of the most common questions about this kind of data structure is for CSV files; specifically in relation to Microsoft Excel. The C++ I/O library actually makes handling these kind of things relatively easy for simple data, but for more advanced handling, see the topic Parse CSV data?
C++
Topic: String
What’s the difference between a token and a field?
Browse random answers:
What are the C-Style Character String?
Exaplain about c_str and example?
Explain about the string operate data with example ?
Explain about string get_allocator ?
Explain about string copy with example ?
Explain about string find method with example ?
Explain about string rfind method with example ?
Explain about string find_first_of method and with example ?
Explain about find_last_of method with example ?
Explain about find_first_not_of method with example ?
Explain about find_last_not_of method with example ?
Explain about find_last_of method with example ?
Explain about Insert into string method with example ?
Explain about Return length of string method with example ?
Explain about Return maximum size of string method with example ?
Explain about operator+= with example ?
Explain about operator= method with example ?
Explain about operator[] method with example ?
Explain about push_back method with example ?
Explain about 'rbegin' method with example ?
Explain about rend method with example ?
Explain about replace method with example ?
Explain about reserve method with method ?
Explain about resize method with example ?
Explain about substr method with example ?
Explain about swap method with example ?
Explain about length method with example ?
What is C-string? Explain with an example.?
Problem with C-string
What are the String Class in C++?
What is "strstream??
Define a class to represent a bank account. In the class, include the following members:Data members: name of the depositor, account number, type of account, and balance amount in the account.Member functions: to assign initial values, to deposit an amount, to withdrawal an amount after checking the balance, and to display the name and balance.Write main() code to test your class?
What is the difference between char a[] = ?string?; and char *p = ?string?;?
How to delete an element in array of string?
Can you be bale to identify between Straight- through and Cross- over cable wiring? and in what case do you use Straight- through and Cross-over? (Asked by Cisco system people)
In C++ it was easy to manipulate strings. To read character number 6 you just use
How to break the string of characters into words?
How can I make my class to be output into I/O streams?
What’s the difference between a token and a field?
What will be the output of the program ?#include<stdio.h>#include<string.h>int main(){ char str1[20] = "Hello", str2[20] = " World"; printf("%s\n", strcpy(str2, strcat(str1, str2))); return 0;}
Which of the following function sets first n characters of a string to a given character?
If the two strings are identical, then strcmp() function returns
How will you print \n on the screen?
The library function used to find the last occurrence of a character in a string is
Which of the following function is used to find the first occurrence of a given string in another string?
Which of the following function is more appropriate for reading in a multi-word string?
What will be the output of the program ?#include<stdio.h>#include<string.h>int main(){ char str1[20] = "Hello", str2[20] = " World"; printf("%s\n", strcpy(str2, strcat(str1, str2))); return 0;}
What follows is C++ code to give you a trimmed copy of a string.
How do I convert a std::string to a number?
How to convertir une string en char* ?
How to manipuler un tableau de string ?
What are différence entre string::size() et string::capacity() ?
How manipuler un nom de fichier avec string ?
What are différence entre string::find() et string::find_first_of() ?
