golang control process

Control flow is one of the most basic concepts in programming, which can help programmers control the execution flow of the program. In golang, statements that control flow include: if, switch, for and goto.

if statement

The if statement is a common conditional statement, which can execute the corresponding code block according to different conditional branches. The syntax of the if statement is as follows:

if condition1 {
    // 当条件condition1为真时执行
} else if condition2 {
    // 当条件condition1为假而条件condition2为真时执行
} else {
    // 当条件condition1和condition2都为假时执行
}

It should be noted here that the conditional expression after the if statement must be a Boolean value, such as: true, false, variable name, etc.

switch statement

The switch statement is also a common conditional statement, which can execute different code blocks based on multiple different conditional branches. The syntax of the switch statement is as follows:

switch expression {
    case value1:
        // 当expression等于value1时执行
    case value2, value3:
        // 当expression等于value2或value3时执行
    default:
        // 当所有case条件都不满足时执行
}

It should be noted that the switch statement is followed by an expression, and each case conditional expression must be of the same value type as this expression.

for statement

The for statement is a loop statement that repeatedly executes a specified block of code until the loop exit condition is met. The syntax of the for statement is as follows:

for initialization; condition; post {
    // 循环体
}

Among them, initialization is the initialization statement of the loop variable; condition is the loop conditional statement. The loop body will be executed only when the condition is true; post is the statement to be executed after the loop ends. .

It should be noted that loop conditional statements must be careful not to write endless loops.

goto statement

The goto statement is a jump statement that can skip specified code blocks in the code to execute other code blocks. The syntax of the goto statement is as follows:

goto label
...
...
label:
    // 标签语句块

Among them, label is optional and can be any identifier, which must be unique within a function. Care must be taken when using the goto statement as it can interrupt the normal flow of the program.

In golang, the use of control flow statements is very flexible. You can choose different statements according to your needs to control the execution flow of the program. However, it should be noted that when using these statements, attention should be paid to the readability and maintainability of the program.

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