Go语言入门

Go 语言是一门简单有效的编程语言，可以轻松实现并发、内存安全，并且有很好的性能。以下是一些 Go 语言的入门代码示例：

1. 打印 "Hello, World!"

package main
 
import "fmt"
 
func main() {
    fmt.Println("Hello, World!")
}

2. 变量声明和赋值

package main
 
import "fmt"
 
func main() {
    var a int = 10
    var b int = 20
    var c int
 
    c = a + b
 
    fmt.Println("Value of c is", c)
}

3. 数据类型

package main
 
import "fmt"
 
func main() {
    var a int = 10
    var b float32 = 20.3
    var c string = "Hello, World!"
    var d bool = true
 
    fmt.Printf("a: %v\n", a)
    fmt.Printf("b: %v\n", b)
    fmt.Printf("c: %v\n", c)
    fmt.Printf("d: %v\n", d)
}

4. 运算符

package main
 
import "fmt"
 
func main() {
    a := 10
    b := 20
 
    fmt.Println("Addition:", a+b)
    fmt.Println("Subtraction:", a-b)
    fmt.Println("Multiplication:", a*b)
    fmt.Println("Division:", a/b)
    fmt.Println("Modulus:", a%b)
}

5. 控制流程 - 条件语句

package main
 
import "fmt"
 
func main() {
    a := 10
 
    if a > 5 {
        fmt.Println("a is greater than 5")
    } else {
        fmt.Println("a is not greater than 5")
    }
}

6. 控制流程 - 循环

package main
 
import "fmt"
 
func main() {
    for i := 0; i < 10; i++ {
        fmt.Println("Counter:", i)
    }
}

7. 函数

package main
 
import "fmt"
 
func add(a int, b int) int {
    return a + b
}
 
func main() {
    x := 10
    y := 20
 
    sum := add(x, y)
    fmt.Println("Sum:", sum)
}

8. 指针

package main
 
import "fmt"
 
func swap(a *int, b *int) {
    var temp int
    temp = *a
    *a = *b
    *b = temp
}
 
func main() {
    x := 10
    y := 20
 
    swap(&x, &y)
 
    fmt.Println("x:", x)
    fmt.Println("y:", y)
}

9. 数组

package main
 
import "fmt"
 
func main() {
    var arr [5]int
 
    arr[0] = 10
    arr[1] = 20
    arr[2] = 30
    arr[3] = 40
    arr[4] = 50
 
    for i := 0; i < 5; i++ {
        fmt.Println("Element at", i, "is", arr[i])
    }
}

10. Slice (切片)

package main
 
import "fmt"
 
func main() {
    var numbers []int
 
    numbers = append(numbers, 10)
    numbers = append(numbers, 20)
    numbers = append(numbers, 30)
 
    for i, x := range numbers {