A Guide to Control Statements in Go: Taking Control of Code Flow

Go language control statements allow us to control the code execution flow, including: if-else: execute code blocks based on conditions. switch: Execute different code blocks based on a given value. for: Repeat a block of code until a certain condition is met. range: Traverse the elements in the collection and execute the code block.

Guide to control statements in Go language: Controlling code flow

Control statements allow us to control the flow of code execution in Go programs. The Go language provides a variety of control statements, including:

• if-else: Conditionally execute a code block.
• switch: Execute different code blocks based on the given value.
• for: Repeat a block of code until a certain condition is met.
• range: Traverse the elements in the collection and execute the code block.

if-else

if condition {
    // 代码块 1
} else {
    // 代码块 2
}

switch

switch value {
    case "a":
        // 代码块 1
    case "b":
        // 代码块 2
    default:
        // 默认代码块
}

for

for condition {
    // 代码块
}

range

for index, element := range collection {
    // 代码块
}

Practical case: Calculating prime numbers

Using the Go language, we can use the for loop to Calculate prime numbers:

const N = 100

func main() {
    primes := make([]int, 0, N)
    for i := 2; i < N; i++ {
        isPrime := true
        for j := 2; j < i; j++ {
            if i%j == 0 {
                isPrime = false
                break
            }
        }
        if isPrime {
            primes = append(primes, i)
        }
    }
    fmt.Println(primes)
}

Output:

[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97]

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