An in-depth discussion of Golang statement jumps

Golang is an object-oriented programming language with a powerful jump statement function that allows programmers to be more flexible and efficient when writing programs. In this article, we will delve into Golang statement jumps.

1. What is Golang statement jump?

Golang statement jump refers to the use of jump statements in the program. When the program executes a certain line of code, it jumps to another specified line of code to continue execution, thereby changing the execution flow of the program.

Commonly used jump statements in Golang include break, continue, goto, return, etc. These jump statements can allow the program to execute according to your own needs.

2. Break statement

The break statement can cause the program to jump out of the current loop or selection statement (such as a switch statement) and continue executing the following code.

The following is a sample program:

package main

import "fmt"

func main() {
    for i := 1; i <= 10; i++ {
        if i == 5 {
            break
        }
        fmt.Println(i)
    }   
    fmt.Println("程序继续执行...")
}

This program uses a for loop to traverse an integer sequence from 1 to 10, and uses the if statement to determine if i is equal to 5, then use the break statement to jump out of the loop, Continue executing the following code. Run the program and the output result is:

1
2
3
4
程序继续执行...

It can be seen from the output result that when i equals 5, the loop is jumped out and the following code continues to be executed.

3. The continue statement

The continue statement allows the program to skip the remaining code in the current loop and directly enter the next loop.

The following is a sample program:

package main

import "fmt"

func main() {
    for i := 1; i <= 10; i++ {
        if i == 5 {
            continue
        }
        fmt.Println(i)
    }
}

This program uses a for loop to traverse an integer sequence from 1 to 10, and uses the if statement to determine if i is equal to 5, then use the continue statement to skip the following The code directly enters the next loop. Run the program and the output result is:

1
2
3
4
6
7
8
9
10

It can be seen from the output result that when i equals 5, the following code is skipped and the next loop is entered directly.

4. Goto statement

The goto statement allows the program to jump to a specified line of code for execution under specific conditions, thereby controlling the execution flow of the program. However, because goto statements can easily lead to code confusion and are difficult to maintain, we should try to avoid using goto statements unless absolutely necessary.

The following is a sample program:

package main

import "fmt"

func main() {
    num := 1
    loop:
    fmt.Println(num)
    num++
    if num <= 10 {
        goto loop
    }
    fmt.Println("程序继续执行...")
}

This program uses goto statements to jump to specified lines of code under specific conditions, and uses labels (i.e. loops) to mark specific lines of code. Run the program and the output result is:

1
2
3
4
5
6
7
8
9
10
程序继续执行...

As can be seen from the output result, the goto statement is used to successfully jump to the specified line of code.

5. Return statement

The return statement can exit from the function and return a value (if any) to the caller.

The following is a sample program:

package main

import "fmt"

func sum(a int, b int) int {
    return a + b
}

func main() {
    result1 := sum(1, 2)
    result2 := sum(3, 4)
    fmt.Println(result1)
    fmt.Println(result2)
}

This program defines a function sum to calculate the sum of two integers, and calls the function twice in the main function and uses fmt The .Println statement outputs the results of the two calls. Run the program, the output result is:

3
7

As can be seen from the output result, the program successfully exits from the function and returns a value to the caller.

6. Summary

This article introduces the relevant knowledge of Golang statement jumps, including jump statements such as break, continue, goto and return. When writing a program, we should choose appropriate jump statements based on the actual situation so that the program can be executed according to our own needs. At the same time, we should also be careful not to overuse goto statements to avoid confusing the code and making it difficult to maintain.

The above is the detailed content of An in-depth discussion of Golang statement jumps. For more information, please follow other related articles on the PHP Chinese website!