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Go-11 - Process Control

2022-08-09 01:32:00 【hahyyy】

Conditional judgment

Go language provides the following conditional judgment statements

StatementDescription
if statementConsists of a Boolean expression followed by one or more statements
if...else statement

The optional else statement can be used after the if statement

The expression in the else statement is executed when the boolean expression is false

if nested statementYou can embed one or more if or else if statements within an if or else if statement
switch statementUsed to perform different actions based on different conditions
select statement

Similar to a switch statement, but select will execute a random runnable case

If there is no case to run, it will block until there is a case to run

if else

package mainimport "fmt"func main() {age := 1// The { after the if statement cannot wrapif age <= 18 {fmt.Println("kid")}else{fmt.Println("adult")}}

switch

 // defines a new type Gender using the type keywordtype Gender int8// constant => all uppercase identifiersconst (MALE Gender = 1FEMALE Gender = 2)gender := MALE// Match the following case statement value -> match genderswitch gender {case FEMALE:fmt.Println("female")case MALE:fmt.Println("male")default:fmt.Println("unknow")}

Loop

Go language provides the following types of loop processing statements

loop type

Description

for loopRepeat block of statements
Loop NestingNest one or more for loops within a for loop

Go language supports the following loop control statements

Control StatementDescription
break statementoften used to interrupt the current for loop or jump out of a switch statement
continue statementSkip the remaining statements of the current loop and continue to the next loop
goto statementTransfer control to the marked statement

Infinite loop

If the conditional statement in the loop is never false, an infinite loop will be executed. We can execute an infinite loop by setting only one conditional expression in the for loop statement

for true{// It's ok without true// for {fmt.Println("This is an infinite loop")}

for Accumulation

sum := 0// Here i is a temporary variable, which will be recycled after usefor i := 0; i < 10; i++ {if sum > 50 {break}sum += i}// The usage of break and continue is no different from other languagesfmt.Println(sum)

Traverse

Use for range to traverse arrays, slices, and dictionaries

nums := []int{10, 20, 30, 40}for i, num := range nums {fmt.Println(i, num)}// 0 10// 1 20// 2 30// 3 40m2 := map[string]string{"Sam": "Male","Alice": "Female",}for key, value := range m2 {fmt.Println(key, value)}// Sam Male// Alice Female

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