Golang Control Statement Practical Guide: Improving Code Efficiency

Go Control Statement Guide: If/Else Statement: Execute a block of code based on a condition. For example: display information based on user input. Switch statement: Execute a block of code based on an expression matching value. For example: display prompts according to seasons. For Loop: Repeatsly executes a block of code until a condition is not met. For example: traverse the array to calculate the average.

Go Control Statement Practical Guide: Improving Code Efficiency

The Go language provides a wealth of control statements for controlling code flow execution. These control statements include if/else, switch, and for loops. By mastering these control statements, you can write clearer, more concise code while improving the readability and maintainability of your code.

If/Else statement

The if/else statement is used to execute the code block when the following conditions are met:

if condition {
  // 条件满足时执行的代码
} else {
  // 条件不满足时执行的代码
}

Actual case: According to User input display information

import (
  "fmt"
)

func main() {
  fmt.Print("请输入用户名：")
  var username string
  fmt.Scan(&username)

  if username == "admin" {
    fmt.Println("欢迎管理员！")
  } else {
    fmt.Println("普通用户欢迎")
  }
}

Switch statement

The switch statement is used to selectively execute a block of code based on an expression matching condition value:

switch expression {
  case value1:
    // 当 expression 值等于 value1 时执行的代码
  case value2, value3:
    // 当 expression 值等于 value2 或 value3 时执行的代码
  default:
    // 都不满足时执行的代码
}

Practical case: Display prompts according to seasons

package main

import "fmt"

func main() {
  fmt.Print("请输入季节：")
  var season string
  fmt.Scan(&season)

  switch season {
  case "spring":
    fmt.Println("万物复苏的春天！")
  case "summer":
    fmt.Println("炎炎夏日！")
  case "autumn":
    fmt.Println("秋风萧瑟！")
  case "winter":
    fmt.Println("白雪皑皑的冬天！")
  default:
    fmt.Println("无效的季节")
  }
}

For loop

The for loop is used to repeatedly execute a block of code until the conditions are no longer met. So far:

for condition {
  // 循环中执行的代码
}

Practical case: Traverse the array and calculate the average

package main

import "fmt"

func main() {
  numbers := []int{1, 2, 3, 4, 5}
  sum := 0

  for _, number := range numbers {
    sum += number
  }

  average := float64(sum) / float64(len(numbers))
  fmt.Println(average)
}

By proficiently using the control statements of the Go language, developers can write more efficient and easier-to-maintain code. Control statements such as if/else, switch, and for loops provide flexibility and control, allowing programmers to control the flow of code execution as needed. These examples demonstrate how to apply control statements to real-world problems to improve code efficiency and readability.

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