CSCI 1301 Book Labs Slides Exercises

Datatypes in C#

https://csci-1301.github.io/about#authors

May 22, 2024 (01:30:36 PM)

Value Types

Numeric

Signed Integer

Type Range Size
sbyte -128 to 127 Signed 8-bit integer
short -32,768 to 32,767 Signed 16-bit integer
int -2,147,483,648 to 2,147,483,647 Signed 32-bit integer
long -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 Signed 64-bit integer

Unsigned Integer

Type Range Size
byte 0 to 255 Unsigned 8-bit integer
ushort 0 to 65,535 Unsigned 16-bit integer
uint 0 to 4,294,967,295 Unsigned 32-bit integer
ulong 0 to 18,446,744,073,709,551,615 Unsigned 64-bit integer

Floating-point Numbers

Type Approximate Range Precision
float ±1.5e−45 to ±3.4e38 7 digits
double ±5.0e−324 to ±1.7e308 15–16 digits
decimal (-7.9 x 1028 to 7.9 x 1028)/(100 to 1028) 28–29 significant digits

Logical

Type Possible Values Size
bool true, false 8-bit

Character

Type Range Size
char U+0000 to U+ffff Unicode 16-bit character

Literals

Name Corresponding datatype Examples
Integer Literal int 40, -39, 291838, 0, …
Float Literal float 3.5F, -43.5f, 309430.70006F, …
Double Literal double 28.98, 239.0, -391.089, 0.0, …
Decimal Literal decimal 8.95m, 3283.9M, -30m, …
Boolean Literal bool true, false
Character Literal char 'Y', 'a', '0', '\n', '\x0058', '\u0058', …

Compatibility

This table is to be read as

✓ means that those values or variables from the datatypes in the row and column can be “operated together” (meaning, you can for instance multiply them), ✘ means that those values or variables from the datatypes in the row and column cannot be “operated together” (meaning, you cannot for instance multiply them).

Integer Literal Float Literal Double Literal Decimal Literal
int ✓ ✘ ✘ ✘
float ✓ ✓ ✘ ✘
double ✓ ✓ ✓ ✘
decimal ✓ ✘ ✘ ✓

Result Type of Operations

This table is to be read as

Values or variables from the datatypes in the row and column can be “operated together” and will produce the datatype indicated in the cell, or cannot be “operated together” if the value in the cell is “illegal”.s

int float double decimal
int int float double decimal
float float float double illegal
double double double double illegal
decimal decimal illegal illegal decimal

References