Golang Learning Notes-1.3 variables

* * This is the third Golang language Learning Tutorial **var declaration statement You can create a variable of a specific type, then append a name to the variable and set the initial value of the variable. The variable declaration syntax is as follows ***:>**var variable name type = Expression * * Example: "' govar age int ="-----------------where * * "type" * * or "= expression" * * Two can omit one of them. > If Type * * is omitted, type information is determined based on the initial expression. If you omit the **= expression * *, the variable is initialized with a value of 0. Example 1: "Gopackage mainimport" FMT "Func Main () {var age = 19//omit type, based on an automatic expression to determine the age type FMT. Println ("Hello world,my is", age)} "the program above will print: >hello world,my is 19 example 2: ' Gopackage mainimport ' FMT ' func main ( ) {var age int//omit expression, which is initialized with 0 by default, FMT. Println ("Hello world,my is", age)} "the program above will print: >hello world,my is 0# declares multiple variables go can declare multiple variables with a single statement. Declare multiple variable syntax as follows ***:>var name1, name2 type = initialvalue1, initialvalue2 example: ' Gopackage mainimport ' FMT ' func main () {var Height,weight = 178,57//declaration of two variables height, weight fmt. Println ("My height is", the height, "and my weight is", weight)} "' Above the program will print: >my height is 178 and my weight is 57 in some cases we may need to Declare variables of different types in one statement. A statement declares different types of variable syntax as follows: "' Govar (name1 = initialvalue1 name2 = initialvalue2) Example: ' Gopackage mainimport ' FMT ' func Main () {var (name = "Xunk" age = height = 178) fmt. Println ("My Name is", "name", ",", "", "", "", "", "", "", "", "" and "Heiget", "height")} ' will print: >my name is Xunk Y Heiget is 178# Short declaration go supports a concise way of declaring variables, using the: = operator, called a short declaration. The short declaration syntax is as follows: ***>name: = InitialValue Example: "Gopackage mainimport" FMT "Func Main () {name,age: =" Xunk ", 19//Short declaration Name,age Fmt. Println ("My Name is", "name", "My Age is", and "age") above the program will print: >my name is Xunk my age is 19:= short declaration all the variables on the left have an initial value, and the operator must have a variable The amount is not yet declared. Variables can also be assigned at run time. Example: ' Gopackage mainimport ("FMT" "math") func main () {b: = 25.3,73.1//declares a B variable c: = Math. Min (A, B)//compare A, B minimum value, assign to C FMT. Println ("The minimum values is", c)} "the program above will print: >the minimum values is 25.3\ because Go is a strongly typed (strongly Typed) language, Therefore, a variable of one type is not allowed to be assigned a value of another type. "' ' Gopackage mainfunc Main () {age: = +///is an int type =" Naveen "///error, trying to assign a string to an int type variable}" * Above program will error:*> (type Strin g) as type int in assignment it is not possible to assign a string to an int type variable 81 reads