Is string a keyword?
A string is NOT a keyword. It is one of the names of data types declared in the standard library.
How to check if a string is a keyword in C++?
- In C++ there is no special method to check whether the given string is a keyword or not. But there are a set of keywords present which is listed below-
“auto”, “break”, “case”, “char”, “const”, “continue”, “default”, “do”, “double”, “else”, “enum”, “extern”, “float”, “for”, “goto”, “if”, “int”, “long”, “register”, “return”, “short”, “signed”, “sizeof”, “static”, “struct”, “switch”, “typedef”, “union”, “unsigned”, “void”, “volatile”, “while”
- So, we need to check whether our search word is present in the list or not to determine whether it is a keyword or not. As there is no keyword “string” in the above-mentioned list, a string is not a keyword.
How to check if a string is a keyword in Java?
- Java provides a method iskeyword() which is used to find whether the given string is a keyword or not. It is present in javax.lang.model.SourceVersion package. It will return a boolean value either True or False.
Syntax:
SourceVersion.isKeyword(“word_to_check”)
Parameters:
This method accepts a string to check whether it is a keyword or not.
Returns:
Boolean values – True or False.
How to check if a string is a keyword in Python?
- Python provides a method iskeyword() which is used to find out whether the given string is a keyword or not. It is present in the keyword built-in module. So, before using this method we need to import the keyword module.
- The iskeyword() method accepts a word/string as a parameter and returns a Boolean value True or False based on the input argument. It returns true for all the reserved words and for the rest it will give the result as False.
Syntax:
keyword.iskeyword(“word_to_check”)
Below is the code for implementing the methods to check if “string” is a keyword or not.
C++
// C++ program for the above approach#include <bits/stdc++.h>using namespace std;set<string> keywords = { "alignas", "alignof", "and", "and", "and_eq", "asm", "atomic_cancel", "atomic_commit", "atomic_noexcept", "auto", "bitand", "bitor", "bool", "break", "case", "catch", "char", "char16_t", "char32_t", "class", "compl", "concept", "const", "constexpr", "const_cast", "continue", "co_await", "co_return", "co_yield", "decltype", "default", "delete", "do", "double", "dynamic_cast", "else", "enum", "explicit", "export", "extern", "false", "float", "for", "friend", "goto", "if", "import", "inline", "int", "long", "module", "mutable", "namespace", "new", "noexcept", "not", "not_eq", "nullptr", "operator", "or", "or_eq", "private", "protected", "public", "register", "reinterpret_cast", "requires", "return", "short", "signed", "sizeof", "static", "static_assert", "static_cast", "struct", "switch", "synchronized", "template", "this", "thread_local", "throw", "true", "try", "typedef", "typeid", "typename", "union", "unsigned", "using", "virtual", "void", "volatile", "wchar_t", "while", "xor", "xor_eq" };// Function to check c++ keywordbool is_keyword(string s) { return keywords.count(s); }int main(){ // Passing String to iskeyword() to check // if it is a keyword or not cout << is_keyword("string"); return 0;} // This code is contributed by rakeshsahni |
Java
// Import necessary packagesimport java.io.*;import javax.lang.model.SourceVersion;class GFG { public static void main(String[] args) { // Checking whether string is a keyword or not System.out.println( SourceVersion.isKeyword("string")); }} |
Python3
# Import necessary packagesimport keywordif __name__ == '__main__': # Passing String to iskeyword() to check # if it is a keyword or not print(keyword.iskeyword('String')) |
Javascript
// A function to check if a given word is a JavaScript keyword or notconst isKeyword = (word) => { // An array containing all the JavaScript keywords const keywords = [ "abstract", "await", "boolean", "break", "byte", "case", "catch", "char", "class", "const", "continue", "debugger", "default", "delete", "do", "double", "else", "enum", "export", "extends", "false", "final", "finally", "float", "for", "function", "goto", "if", "implements", "import", "in", "instanceof", "int", "interface", "let", "long", "native", "new", "null", "package", "private", "protected", "public", "return", "short", "static", "super", "switch", "synchronized", "this", "throw", "throws", "transient", "true", "try", "typeof", "var", "void", "volatile", "while", "with", "yield" ]; // Check if the word is in the keywords array return keywords.includes(word);};// Calling the function with a test word and storing the resultlet ans = isKeyword('String');// Printing the resultconsole.log(ans);// Contributed by adityae15 |
Output
false
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