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945_6DataTypesSummary.pdf

SummaryofCProgrammingBasicDataTypes

IntegralTypesͲSeelimits.hforimplementationͲspecificdetailsandcertaindefinedconstant s

Type akaTypical

bytes

Typicalmin Typicalmax printf scanf Notes

int4Ͳ2,147,483,648 2,147,483,647%d%i%o%x%X%d%i%o%x%X Mostcommonintegertype.

Matchesmachine"word"size.

shortint short 2Ͳ32768 32767%hd%hi%ho%hx%hX%hd%hi%ho%hx%hX Sizeчsizeofint longint long 4Ͳ2,147,483,648 2,147,483,647%ld%li%lo%lx%lX%ld%li%lo%lx%lX Sizeшsizeof int longlongint longlong 8~Ͳ9.223x1018 ~9.223x10 18 %lld%lli%llo%llx%llX%lld%lli%llo%llx%llXMustbeatleast64bits unsignedin t unsigned 4 0 4,294,967,295%ud%ui%uo%ux%uX%ud%ui%uo%ux%uX unsignedshor t

2 0 65,535%uhd%uhi%uho%uhx%uhX%uhd%uhi%uho%uhx%uhX

unsignedlon g

4 0 4,294,967,295%uld%uli%ulo%ulx%ulX%uld%uli%ulo%ulx%ulX

unsignedlonglong 8 0~1.845x10 19 %ulld%ulli%ullo%ullx%ullX%ulld%ulli%ullo%ullx%ullX char 1Ͳ128 127%d%i%o%x%X%d%i%o%x%XNormallycharacters(below) unsignedchar

1 0 255%ud%ui%uo%ux%uX%ud%ui%uo%ux%uX

IntegerConstantFormatsͲnormallysignedintsunlessatrailingLorUindicateslongintand/orunsignedrespectivel

Decimal [+Ͳ]1Ͳ9[0Ͳ9...][LlUu] Optionalsign,followedbyadigitfrom1to9,followedbyoptionaldigitsfrom0to9,optionallyfollowedbyLorU

Octal [+Ͳ]0[0Ͳ7...][LlUu] Optionalsign,followedbyaleading0,followedbyoptionaldigitsfrom0to7,optionallyfollowedbyLorU

Hexadecimal [+Ͳ]0x[0Ͳ9aͲfAͲF...][LlUu

] Optionalsign,followedby0x,followedbyoptionaldigits0toFinupperorlowercase,optionallyfollowedbyLorU FloatingPointTypesͲSeefloat.hforimplementationͲspecificdetailsandcertaindefinedconstants .

TypeTypical

bytes

Smallestpositiv

LargestValue printf scanf Precision

float 4

1.17549x10

Ͳ38

3.40282x1038

%f%e%E%g%G%f%e%E%g%G~6decimaldigits double82.22507x10

Ͳ308

1.79769x10

308
%f%e%E%g%G%lf%le%lE%lg%lG~15decimaldigits longdouble 80or128bits %Lf%Le%LE%Lg%LG%Lf%Le%LE%Lg%LG

FloatingPointConstantFormat

s ͲNormallydoublesunlessatrailingForLisappliedtoindicatefloatorlongdoubletypesrespectively . [+Ͳ]1Ͳ9[0Ͳ9...].[0Ͳ9...][[Ee[+Ͳ]0Ͳ

9...][FfLl] Thepresenceofadecimalpointnormallyindicatesadoubleprecisionnumber.

[+Ͳ][0].[0Ͳ9...][[Ee[+Ͳ]0Ͳ9...][FfLl] Iftheleadingdigitisa0orabsent,noadditionaldigitsmaypreceedthedecimalpoint.

[+Ͳ]1Ͳ9[0Ͳ9...]Ff[Ll] Ifnodecimalpointispresent,theneithertheForEnotationisrequiredtoindicateafloatingpointdatatype

[+Ͳ]1Ͳ9[0Ͳ9...]Ee[+Ͳ]0Ͳ9...[FfLl]Exponentialnotationindicatesmultiplicationbyagivenpowerof10.e.g.6.02E23

=6.02x1023

CharacterType

Thechartypeoccupies1bytes,uses%forbothprintfandscanf,andprintstheASCIIcharactercorrespondingtoitsnumericalvalu

e Constantcharsareenclosedinsinglequotes('A'),andmayincludeescapesequencessuchas'\n','\t',etc .

CharacterString

Arraysofcharactersusethe%sformatspecifierforbothprintfandscanf.ScanningstopsonthefirstwhiteͲspacecharacterreadin

Constantcharacterstrings

areenclosedindoublequotes,andmayalsoincludeescapecharacters,e.g."\n\nPleaseenterX>"

SpecialTypes:enum,struct,_Bool,_Complex,_Imaginar

y RelatedFunctionsandConcepts:sizeof(),typedef,typecasting

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