The constants are nothing but the fixed values that the program may not alter during its execution. These fixed values are also called literals. Var const I = 10;
The constants are treated just like regular variables except that their values cannot be modified after their definition.
Constants can be of any of the basic data types like
The constants are treated just like regular variables except that their values cannot be modified after their definition.
an integer constant,
a floating constant,
a character constant, or
a string literal. There are also enumeration constants as well.
Integer literals
An integer literal can be a
decimal,
octal, or
hexadecimal constant.
A prefix specifies the base or radix:
A prefix specifies the base or radix:
0x or 0X for hexadecimal,
0 for octal, and
nothing for decimal.
Suffix with the combination of U and L, for unsigned and long, respectively.
The suffix can be uppercase or lowercase and can be in any order.
Here are some examples of integer literals:
512 /* Legal */
265u /* Legal */
0xFddL /* Legal */
0012 /* Illegal: Two 0 in the front its an octal declaration */ it should be 012
032UL /* Illegal: cannot repeat a suffix and it can be 032U */
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Following are other examples of various type of Integer literals:
24 /* decimal */
0313 /* octal */
0x1b /* hexadecimal */
60 /* int */
90u /* unsigned int */
90l /* long */
90ul /* unsigned long */
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Floating-point literals
A floating-point literal has an integer part, a decimal point, a fractional part, and an exponent part. You can represent floating point literals either in decimal form or exponential form.
While representing using decimal form, you must include the decimal point, the exponent, or both and while representing using exponential form, you must include the integer part, the fractional part, or both. The signed exponent is introduced by e or E.
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Here are some examples of floating-point literals:
Constant keyword provides you the option of not modifying the data,
const variablename variabletype = value;
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sample go program
package main
import "fmt"
func main() {
const LENGTH int = 4
const WIDTH int = 5
var area int
area = LENGTH * WIDTH
fmt.Printf("area : %d", area)
}
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Output for the above go program :
area: 20
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Key points on constants
const declares a constant value.
A const statement can appear anywhere a var statement can.
Constant expressions perform arithmetic with arbitrary precision.
A numeric constant has no type until it’s given one, such as by an explicit cast.
A number can be given a type by using it in a context that requires one, such as a variable assignment or function call. For example, here math.Sin expects a float64.
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