C/C++ Keywords and their uses

C/C++ Keywords and their uses

Keywords are reserved words that have special meaning to the compiler. They cannot be used as a variable name or identifier. All the keywords are written in lowercase. There are 32 keywords in C and 63 keywords + 11 (extra) in C++ which are not needed when ASCII characters are used.

Here’s the list of all C and C++ keywords with their respective uses:

KeywordPurposeC or C++
asmInserts an assembly instructionC++
autoDeclares a local variableC,C++
boolDeclares a boolean variableC++
breakBreaks the loop and control is out of the loopC,C++
caseA block of code in a switch statementC,C++
catchHandles exceptions of throwC++
charDeclares a character variableC,C++
classDeclares a classC++
constDeclares data or functions that do not change valueC,C++
const_castCasts from const variablesC++
continueBypass iterations of a loopC,C++
defaultDefault handler in a switch statementC,C++
deleteMakes memory availableC++
doDeclares do-while loopC,C++
doubleDeclare a double precision floating-point variableC,C++
dynamic_castPerforms runtime castsC++
elseAlternate case for an if statementC,C++
enumCreate enumeration typesC,C++
explicitOnly use constructors when they exactly matchC++
exportAllows the separation of definition of template from its usagesC++
externTell the compiler about variables defined elsewhereC,C++
falseThe boolean value of falseC++
floatDeclare a floating-point variableC,C++
forDeclares for loopC,C++
friendGrants non-member function access to private dataC++
gotoJumps to a different part of the programC,C++
ifExecutes code by checking a conditionC,C++
inlineOptimizes calls to short functionsC++
intDeclares an integer variableC,C++
longDeclares a long integer variableC,C++
mutableOverrides a const variableC++
namespacePartitions the global namespace by defining a scopeC++
newAllocates dynamic memory for a new variableC++
operatorCreates overloaded operator functionsC++
privateDeclares private members of a classC++
protectedDeclares protected members of a classC++
publicDeclares public members of a classC++
registerRequest that a variable be optimized for speedC,C++
reinterpret_castChanges the type of a variableC++
returnReturns a value from a methodC,C++
shortDeclares a short integer variableC,C++
signedModifies variable type declarationsC,C++
sizeofReturns the size of a variable or typeC,C++
staticCreates permanent storage for a variableC,C++
static_castPerforms a non-polymorphic castC++
structDefines a new structureC,C++
switchExecutes code for different values of a variableC,C++
templateCreates generic functionsC++
thisPointer to the current objectC++
throwThrows an exceptionC++
trueThe boolean value of trueC++
tryExecutes a code that can throw an exceptionC++
typedefCreates a new type name from an existing typeC,C++
typeidDescribes an objectC++
typenameDeclares a class or undefined typeC++
unionStructure that assigns multiple variables to the same memory locationC,C++
unsignedDeclares an unsigned integer variableC,C++
usingImports complete or partial namespaces into the current scopeC++
virtualCreates a function that can be overridden by a derived classC++
voidDeclares functions or data with no associated data typeC,C++
volatileWarns the compiler about variables that can be modified unexpectedlyC,C++
wchar_tDeclares a wide-character variableC++
whileDeclares while loopC,C++

Conclusion-

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