Data Types

This page has been superceded by a wiki version of this example: DataTypesExample

I'm going to start with the basics: whole numbers. This code will show the upper and lower limits for the integer data types in D and sizes for other data types. It's pretty fancy, so hopefully I'm doing this right. I make use of the min and max attributes.

Code



int main() 

{

    // Show information about integer types...

    printf("bit\tmin: %d\tmax: %d (%u)\n", bit.min, bit.max, bit.size);  

    printf("ubyte\tmin: %u\tmax: %u (%u)\n", ubyte.min, ubyte.max, ubyte.size);  

    printf("ushort\tmin: %u\tmax: %u (%u)\n", ushort.min, ushort.max, ushort.size);  

    printf("uint\tmin: %u\tmax: %u (%u)\n", uint.min, uint.max, uint.size);  

    printf("ulong\tmin: %llu\tmax: %llu (%u)\n", ulong.min, ulong.max, ulong.size);    

    printf("byte\tmin: %d\tmax: %d (%u)\n", byte.min, byte.max, byte.size);  

    printf("short\tmin: %d\tmax: %d (%u)\n", short.min, short.max, short.size);    

    printf("int\tmin: %d\tmax: %d (%u)\n", int.min, int.max, int.size);    

    printf("long\tmin: %lld\tmax: %lld (%u)\n", long.min, long.max, long.size);    



    // Show information about floating-point types...

    printf("float (%u)\tdouble (%u)\treal (%u)\t", float.size, double.size, real.size);

    printf("ifloat (%u)\tidouble (%u)\tireal (%u)\t", ifloat.size, idouble.size, ireal.size);

    printf("cfloat (%u)\tcdouble (%u)\tcreal (%u)\t", cfloat.size, cdouble.size, creal.size);

    printf("cfloat (%u)\tcdouble (%u)\tcreal (%u)\t", cfloat.size, cdouble.size, creal.size);



    // Show information about character types...

    printf("char (%u)\twchar (%u)\tdchar (%u)\t", char.size, wchar.size, dchar.size);



    return 0;

}

Output

bit     min: 0  max: 1 (1)

ubyte   min: 0  max: 255 (1)

ushort  min: 0  max: 65535 (2)

uint    min: 0  max: 4294967295 (4)

ulong   min: 0  max: 18446744073709551615 (8)

byte    min: -128       max: 127 (1)

short   min: -32768     max: 32767 (2)

int     min: -2147483648        max: 2147483647 (4)

long    min: -9223372036854775808       max: 9223372036854775807 (8)

float (4)       double (8)      real (10)       ifloat (4)      idouble (8)

ireal (10)      cfloat (8)      cdouble (16)    creal (20)      cfloat (8)

cdouble (16)    creal (20)      char (1)        wchar (2)       dchar (4)

Integer Types

Type	Min	Max	Size (bytes)
bit	0	1	1
ubyte	0	255	1
ushort	0	65,535	2
uint	0	4,294,967,295	4
ulong	0	18,446,744,073,709,551,615	8
byte	-128	127	1
short	-32,768	32,767	2
int	-2,147,483,648	2,147,483,647	4
long	-9,223,372,036,854,775,808	9,223,372,036,854,775,807	8

Floating-Point Types

Floating point:
- float
- double
- real
Complex and Imaginary:
- cfloat
- cdouble
- creal
Complex and Imaginary:
- ifloat
- idouble
- ireal

Character Types

char: unsigned 8 bit (UTF-8)
wchar: unsigned 16 bit (UTF-16)
dchar: unsigned 32 bit (UTF-32)

The official list is in the D Specification, of course.

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