In-depth understanding of Golang flow control statements

Go language provides a wealth of flow control statements for controlling the flow of program flow, including: conditional statements (if, switch); loop statements (for, while); practical cases: calculating factorials using if and for statements; others Flow control statements (break, continue, goto, defer).

In-depth understanding of Go language flow control statements

Flow control statements are the basic tools used to control the flow of program flow in programming. The Go language provides a wealth of flow control statements, including:

Conditional statements

• if statements: used according to Conditionally execute code blocks.

  if condition {
  // 条件为 true 时执行的代码
  } else {
  // 条件为 false 时执行的代码
  }

• switch Statement: Used to execute a block of code based on one of multiple conditions.

  switch variable {
  case value1:
    // variable 为 value1 时执行的代码
  case value2:
    // variable 为 value2 时执行的代码
  default:
    // 其他情况执行的代码
  }

Loop statement

• ##for Loop: used to repeatedly execute a block of code.

  for condition {
  // 条件为 true 时执行的代码
  }
  
  for i := 0; i < 10; i++ {
  // i 从 0 到 9 执行 10 次循环
  }

• while Loop: used to execute a block of code as long as the condition is true.

  while condition {
  // 条件为 true 时执行的代码
  }

Practical case: Calculating factorial

The following is a Go language program for calculating factorial:

package main

import "fmt"

func main() {
  var n int
  fmt.Print("请输入一个非负整数：")
  fmt.Scan(&n)

  if n < 0 {
    fmt.Println("输入无效，必须是非负整数")
    return
  }

  result := 1
  for i := 1; i <= n; i++ {
    result *= i
  }

  fmt.Printf("%d 的阶乘为 %d\n", n, result)
}

Program usage# The ##if

statement checks whether the input is valid and uses a for loop to calculate the factorial.

Other flow control statements

The Go language also provides other flow control statements, including:

break
• : Exit the loop or switch statement.
continue
• : Skip the current iteration in the loop.
goto
• : Jump to another location in the program.
defer
• : Delay the execution of a function until the current function returns.

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