Predefined C# value types
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sbyte: Holds 8-bit signed integers. The s in sbyte stands for signed, meaning that the
variable's value can be either positive or negative. The smallest possible value for ansbyte
variable is -128; the largest possible value is 127.
byte: Holds 8-bit unsigned integers. Unlike sbyte variables, byte variables are not signed and
can only hold positive numbers. The smallest possible value for a byte variable is 0; the
largest possible value is 255.
short: Holds 16-bit signed integers. The smallest possible value for a short variable is 32,768; the largest possible value is 32,767.
ushort: Holds 16-bit unsigned integers. The u in ushort stands for unsigned. The smallest
possible value of an ushort variable is 0; the largest possible value is 65,535.
int: Holds 32-bit signed integers. The smallest possible value of an int variable is 2,147,483,648; the largest possible value is 2,147,483,647.
uint: Holds 32-bit unsigned integers. The u in uint stands for unsigned. The smallest possible
value of a uint variable is 0; the largest possible value is 4,294,967,295.
long: Holds 64-bit signed integers. The smallest possible value of a long variable is
9,223,372,036,854,775,808; the largest possible value is 9,223,372,036,854,775,807.
ulong: Holds 64-bit unsigned integers. The u in ulong stands for unsigned. The smallest
possible value of a ulong variable is 0; the largest possible value is
18,446,744,073,709,551,615.
char: Holds 16-bit Unicode characters. The smallest possible value of a char variable is the
Unicode character whose value is 0; the largest possible value is the Unicode character whose
value is 65,535.
float: Holds a 32-bit signed floating-point value. The smallest possible value of a float type is
approximately 1.5 times 10 to the 45th power; the largest possible value is approximately 3.4
times 10 to the 38th power.
double: Holds a 64-bit signed floating-point value. The smallest possible value of a double is
approximately 5 times 10 to the 324th; the largest possible value is approximately 1.7 times
10 to the 308th.
decimal: Holds a 128-bit signed floating-point value. Variables of type decimal are good for
financial calculations. The smallest possible value of a decimal type is approximately 1 times
10 to the 28th power; the largest possible value is approximately 7.9 times 10 to the 28th
power.
bool: Holds one of two possible values, true or false. The use of the bool type is one of the
areas in which C# breaks from its C and C++ heritage. In C and C++, the integer value 0
was synonymous with false, and any nonzero value was synonymous with true. In C#,
however, the types are not synonymous. You cannot convert an integer variable into an
equivalent bool value. If you want to work with a variable that needs to represent a true or
false condition, use a bool variable and not an int variable.