如何使用substring截取字符串

在许多编程语言中，substring 方法或函数用于从一个给定的字符串中提取一部分字符

1. Python:

string = "Hello, World!"
start_index = 0
end_index = 5
sub_string = string[start_index:end_index]
print(sub_string)  # 输出 "Hello"

2. JavaScript:

let string = "Hello, World!";
let startIndex = 0;
let endIndex = 5;
let subString = string.substring(startIndex, endIndex);
console.log(subString);  // 输出 "Hello"

3. Java:

public class Main {
    public static void main(String[] args) {
        String string = "Hello, World!";
        int startIndex = 0;
        int endIndex = 5;
        String subString = string.substring(startIndex, endIndex);
        System.out.println(subString);  // 输出 "Hello"
    }
}

4. C#:

using System;

class Program {
    static void Main() {
        string str = "Hello, World!";
        int startIndex = 0;
        int length = 5;
        string subStr = str.Substring(startIndex, length);
        Console.WriteLine(subStr);  // 输出 "Hello"
    }
}

注意：不同编程语言中 substring 方法的参数和行为可能略有不同。请根据所使用的编程语言查阅相应文档。