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This article mainly explains "how to use conditional statements in Go language". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn how to use conditional statements in Go language.

1. If...else judgment grammar

The use of grammar is no different from that of other languages.

The sample code is as follows:

/ / judgment statement func panduan (an int) {if a > 50 {fmt.Println ("a > 50")} else if a

< 30 { fmt.Println("a < 30") } else { fmt.Println("a = 30") }} func main() { panduan(120)} 执行结果 a >

fifty

2. If nesting syntax

The sample code is as follows

/ / nested judgment func qiantao (b, c uint) {if b > = 100 {b-= 20 if c > b {fmt.Println ("c OK")} else {fmt.Println ("b OK")}

Execution result

C OK

3. Switch statement

The two writing methods do not need to add break.

The sample code is as follows

/ / switch uses func test_switch () {var a uint = 90 var result string switch a {case 90: result = "A" case 80,70,60: result = "B" default: result = "C"} fmt.Printf ("result:% v\ n" Result) switch {case a > 90: result = "A" case a = 80: result = "B" default: result = "C"} fmt.Printf ("result:% v\ n", result)}

Execution result

Result: A

Result: B

Be careful

1. Add a variable after switch, and the following case mainly makes matching judgment. You can also directly use switch {}, case to directly match the results of relational operations.

2. You can choose to match multiple items in case.

4. Type switch statement

Switch statements can use type-switch for type determination, which feels like a very useful syntax.

The sample code is as follows

/ / Test type switchfunc test_type_switch () {var x interface {} x = 1.0 switch I: = x. (type) {case nil: fmt.Printf ("x type =% T\ n", I) case bool String: fmt.Printf ("x type = bool or string\ n") case int: fmt.Printf ("x type = int\ n") case float64: fmt.Printf ("x type = float64\ n") default: fmt.Printf ("unknown\ n")}}

Execution result

X type = float64

Be careful

1. Interface {} can represent any type.

2. Syntax format variables. (type)

5. Use the fallthrough keyword

Use the fallthrough keyword to enforce the contents of the subsequent case statement, whenever the case condition is triggered.

The sample code is as follows

/ / Test fallthroughfunc test_fallthrough () {a: = 1 switch {case a

< 0: fmt.Println("1") fallthrough case a >

0: fmt.Println ("2") fallthrough case a

< 0: fmt.Println("3") fallthrough case a < 0: fmt.Println("4") case a >

0: fmt.Println ("5") fallthrough case a < 0: fmt.Println ("6") fallthrough default: fmt.Println ("7")}}

Execution result

two

three

four

Be careful

If there is no fallthrough in the case content once the case content is executed down, the case content is stopped.

At this point, I believe you have a deeper understanding of "how to use conditional statements in Go language". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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