Go a road

First, declare variables

was a int 
was b esterification 
was c [] float32
 was d func () bool 
was e struct { 
    x int 
}

• Line 1, declare a variable of type integer, integer values ​​can be saved.
• Line 2, declare a variable of type String.
• Line 3, declaring a 32-bit floating-point variable slice type, floating-point data structure represented by a plurality of slice floating point types.
• Line 4, declare a Boolean return value of a function of variables, this form is generally used for the callback function, the function is about to be preserved in the form of variables, when needed again call this function.
• Line 5, declare a variable of type structure, this structure has a field integer x.

　var  begins with the keyword, variable name to be declared in the middle, and its type on the back.

　Go language variable declaration format is:

var variable name variable type

In addition you can also batch import

var (
    a int
    b string
    c []float32
    d func() bool
    e struct {
        x int
    }
)

Second, variable initialization

var variable name = type expression

E.g:

was credits int = 100

The above code, 100 and for the same type int int, int can be considered redundant information can be further simplified wording initialized.

On the basis of the standard format, is omitted after the int, the compiler attempts hp variable type derived according to the expression on the right of the equal sign.

was credits = 100

for example:

var B = 40 
var C = 20 is 
var D float32 = 0.17    // if the floating-point variables will not declare default float64 
var E = float32 (BC) * D    // , it is converted to a floating point type int and float points are calculated, otherwise reported int types and float32 the Mismatched 
FUNC main () { 
    fmt.Print (E) 
}

Use structure:

package main

import (
    "fmt"
)

type boby struct {
    id   int
    name string
    age  int
}

var b = boby{0, "jan", 25}

func main() {
    fmt.Printf("The boy's name is %s", b.name)
}

Also can write

package main

import (
    "fmt"
)

type boby struct {
    id   int
    name string
    age  int
}

//var b = boby{0, "jan", 25}
var b boby

func main() {
    b.id=0
    b.name="jan"
    b.age=25
    fmt.Printf("The boy's name is %s", b.name)
}