THINK++ — Engineering Visualized

04 // Type System

Data Types

C++ is statically typed — every variable must declare its type at compile time. The type determines how much memory is allocated and what operations are valid.

Primitive Types

int4BWhole numbers

float4BDecimal (6-7 digits)

double8BDecimal (15-16 digits)

char1BSingle character

bool1Btrue / false

Extended Types

long long8BLarge integers

short2BSmall integers

unsigned int4BNon-negative only

long double16BExtended precision

wchar_t2-4BWide character

sizeof() Operator

Use sizeof(type) to check the exact byte size on your system. Sizes may vary across platforms and compilers.

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