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Xun Zhou
Xun Zhou

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[Golang 02/30] Go declare variables

#go #golang30days 
package main import ( "fmt" ) func main() { // declare a variable with value "hello" var a = "hello" fmt.Printf("\na: %s", a) // shortcut for "var ab string" // it declares a variable named "ab",  // and auto-detect its type and assign the value "hello" to it. ab := "hello" fmt.Printf("\nab: %s", ab) // declare a variable with explicit type var abc string= "hello" fmt.Printf("\nabc: %s", abc) // declare multiple variables with type "int" var b, c int; fmt.Printf("\nb: %d, c:%d", b, c) // declare multiple variables and assign them the values // the types will be auto-detected var d, e = 1, "golang" fmt.Printf("\nd: %d, e: %s", d, e) }
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It prints the following content:

a: hello ab: hello abc: hello b: 0, c:0 d: 1, e: golang
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Summary

In Go, we can declare variables using the var keyword or its shortcut :=.
Golang will assign the default value to the variables, which are not initialized.
For example:

  • string default: empty string
  • int default: 0
  • bool default: false

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